SEO Dictionary: Search Engine Optimization Dictionary

SEO Dictionary: Search Engine Optimization Dictionary - The ultimate search engine optimization (SEO) dictionary with SEO terms and SEO definitions. SEO Dictionary is your one-stop destination for the most authoritative and comprehensive search engine optimization (SEO) terms and definitions.

SEO Dictionary is the best search engine optimization (SEO) dictionary with SEO terms, acronyms, phrases, and their definitions, which was created by SEO University. Combinling scholarly authority with an awareness of today's SEO technology, SEO Dictionary is the simple, reliable way to find the perfect SEO terms and definitions for you need.

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SEO Dictionary - The Ultimate Search Engine Optimization (SEO) Dictionary

SEO Dictionary: List A

A/B Testing

A/B Testing, also known as split testing, is an experimental approach to web design (especially user experience design), which aims to identify changes to web pages that increase or maximize an outcome of interest (e.g., clickthrough rate for a banner advertisment).

Above The Fold

Above The Fold refers to the part of a webpage that users can see without scrolling down.

Absolute Link

Absolute Link, in contrast with a relative link, is a link that specifies the exact location on the Web of a particular page. It is which specifies the location of a web page relative to your current location.


Accessibility refers to the ease of use exhibited by a website with regard to users who have disabilities or impairments.


ActionScript is an object-oriented programming language originally owned by Adobe Systems Incorporated.

Ad-Hoc Query

Ad-Hoc Query is a search request that retrieves information without knowledge of the underlying storage structures of the database.

Administrative Metadata

Administrative Metadata is a type of metadata that helps to manage information resources through elements such as version number, archiving date, and other technical information for purposes of file management, rights management and preservation.


Advertising is a form of communication for marketing and used to encourage or persuade an audience to continue or take some new action.

Affiliate Marketing

Affiliate Marketing is a type of performance-based marketing in which a business rewards one or more affiliates for each visitor or customer brought about by the affiliate's own marketing efforts.

Affiliate Program

Affiliate Program is a method of promoting web businesses in which an affiliate is rewarded for every visitor, subscriber, customer, and/or sale provided through his or her efforts.

Affiliate Site

Affiliate Site is a website that makes money with affiliate marketing by sending visitors to another website to complete the sale, in exchange for fees or commissions.


AI is an acronym for Artificial Intelligence.


AJAX is an acronym for Asynchronous JavaScript and XML.


Algorithm is a set of mathematical instructions that must be followed in a fixed order, and that, especially if given to a computer, will help to calculate an answer to a mathematical problem.


Alt is designed to provide an alternative text description (a text equivalent) for images.

Alt Attribute

Alt Attribute is used in HTML and XHTML documents to specify alternative text (alt text) that is to be rendered when the element to which it is applied cannot be rendered.

Alt Tag

Alt Tag is the alternative tag that the browser displays when the individual does not want to or cannot see the pictures present in a web page.

Analytics Tool

Analytics Tool is a computer program that assists in gathering and analyzing data about website usage. For example, Google Analytics is a feature-rich, popular, free analytics program.

Anchor Text

Anchor Text is the visible, clickable text in a hyperlink.


Android is a Linux-based operating system designed primarily for touchscreen mobile device such as smartphones and tablet computers.


Apache is a popular open source Web server.


API is an acronym for Application Programming Interface.


Apple Inc., formerly Apple Computer, Inc., is an American multinational corporation that designs, develops, and sells consumer electronics, computer software, and personal computers.

Apple TV

Apple TV is a digital media receiver developed and sold by Apple Inc..

Application Programming Interface

Application Programming Interface (API) is a specification intended to be used as an interface by software components to communicate with each other.

Article Directory

Article Directory is a website with collections of articles written about different subjects and gerneral from contributors.

Article Spinning

Article Spinning is a form of content spam techniques by which blog or website owners post a unique version of relevant content on their sites by rewriting existing articles, or parts of articles, and replacing elements to provide a slightly different perspective on the topic.

Article Syndication

Article Syndication is a form of content syndication that is an SEO strategy used to increase the number of backlinks pointing to your website.

Artificial Intelligence

Artificial Intelligence (AI) is the scientific study of the capacity of machines to simulate intelligent human behaviour, such as the ability to understand language, recognize pictures, solve problems and learn.


ASP.NET is a development framework of Microsoft's .NET platform that is created by Microsoft Corporation for creating dynamic web applications and web services.

Asynchronous JavaScript and XML

Asynchronous JavaScript and XML (AJAX) is a group of interrelated web development techniques used on the client-side to create asynchronous web applications.


Atom is a web feed standard based on XML.

Audience Segmentation

Audience Segmentation refers to the process of dividing people into more similar subgroups based upon defined criterion such as product usage, demographics, psychographics, communication behaviors and media use.

Authority Site

Authority Site is a website that has many incoming links from other related authoritative expert or hub websites.

Automated Submitting

Automated Submitting is the use of automated software to submit your web pages or websites to the search engines. The search engines frown upon this practice.

Automatically Generated Content

Automatically Generated Content refers to the content which is generated programmatically. It is considered a violation of Google Webmaster Guidelines.


Autoresponder refers to a computer program that automatically answers e-mail sent to it.

SEO Dictionary: List B

Back-Of-The-Book Index

Back-Of-The-Book Index, also known as book index, is a collection of entries, often alphabetically arranged in an index, made to allow users to locate information in a given book (or related document).


Baidu is a Chinese multinational Internet corporation which provides search engine (Baidu Search), software, cloud computing, and other Internet-related products and services, including an online collaboratively built encyclopedia, a searchable keyword-based discussion forum and more.

Baidu Search

Baidu Search is a Chinese language web search engine owned by Baidu.


Ban refers to that a search engine blocks your site from appearing in its search engine results pages (SERPs).


Backlink, also known as incoming link, inbound link, inlink, or inward link, is a link received by a web node (web page, directory, website, or top level domain) from another web node.


Beacon, also known as a web bug, 1 by 1 GIF, invisible GIF, or tracker GIF, is a line of code placed in an ad or on a web page that helps track the visitors' actions, such as registrations or purchases.


Bebo is a social networking website owned and operated by Criterion Capital Partners.

Behavioral Targeting

Behavioral Targeting refers to a range of technologies and techniques used by online website publishers and advertisers which allows them to increase the effectiveness of their campaigns by capturing data generated by website and landing page visitors.

Big Daddy Update

Big Daddy Update is an update to Google's search engine ranking algorithms for web sites that occurred in early 2006. It is similar in scope to the Florida update.


Bing, formerly known as Live Search, Windows Live Search, and MSN Search, is a search engine owned by Microsoft Corporation. Yahoo! sources its search results information from Bing.

Bing Ads

Bing Ads, formerly known as Microsoft adCenter and MSN adCenter, is a service that provides Pay Per Click (PPC) online advertising on both the Bing and Yahoo! search engines.

Bing Search

Bing Search refers to Bing.


Bingbot is a web crawler deployed by Microsoft to supply Bing.

Bing Webmaster Guidelines

Bing Webmaster Guidelines is the best practices and guidelines to help Bing find, crawl, and index your site.

Black Hat

Black Hat refers to the use of techniques that to varying degrees do not follow the guidelines of search engine and may also exploit the work or property of others.


Blacklist is a basic access control mechanism that allows everyone access, except for the members of the black list.


Blog is a content management system that presents articles (discrete entries or "posts") in reverse chronological order on the World Wide Web.


Blogosphere refers to that blogs exist together as a connected community or as a social network in which everyday authors can publish their opinions.

Blog Spam

Blog Spam, also known as social spam, or comment spam, is a form of spamdexing.

Body Copy

Body Copy is the textual content of a web page, that is visible to users and does not include graphical content, navigation, or information hidden in the HTML source code.

Book Index

Book Index is also known as back-of-the-book index.


Bot is also known as Web spider, Web robot, or Web bot.

Bounce Rate

Bounce Rate refers to the percentage of visitors who enter the website and then leave the website rather than continue viewing other pages within the same website.

Brand Management

Brand Management refers to the process of creating an emotional connection between products, companies and their customers and constituents.


Branding refers to the process of creating a relationship or a connection between a company's product and emotional perception of the customer for the purpose of generation segregation among competition and building loyalty among customers.


Brandjacking is an activity whereby someone acquires or otherwise assumes the online identity of another entity for the purposes of acquiring that person's or business's brand equity.

Breadcrumb Navigation

Breadcrumb Navigation, also known as breadcrumb trail, is a navigation aid used in user interfaces, by which users keep track of their locations within programs or documents.

Breadcrumb Trail

Breadcrumb Trail is also known Breadcrumb Navigation.

Bridge Page

Bridge Page, also known as doorway page, portal page, jump page, gateway page, or entry page.

Broken Link

Broken Link, also known as dead link or dangling link, is a link that does not work any more.

Browser Cookie

Browser Cookie is also known as cookie, HTTP cookie, or web cookie.

SEO Dictionary: List C


CAC is an acronym for Customer Acquisition Cost.


Cache is a component that transparently stores data so that future requests for that data can be served faster.

Cascading Style Sheets

Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language.

Case Sensitivity

Case Sensitivity refers to that words can differ in meaning based on differing use of uppercase and lowercase letters.

Cell Phone

Cell Phone is also known as mobile phone, cellular phone, or hand phone.

Cellular Phone

Cellular Phone is also known as mobile phone, cell phone, or hand phone.


Churnalism is a form of journalism in which press releases, wire stories and other forms of pre-packaged material are used to create articles in newspapers and other news media in order to meet increasing pressures of time and cost without undertaking further research or checking.


In object-oriented programming, a class is a construct that is used to create instances of itself - referred to as class instances, class objects, instance objects or simply objects. A class defines constituent members which enable its instances to have state and behavior.


Clickthrough is the act of a user clicking a particular ad or SERP.

Clickthrough Rate

Clickthrough Rate (CTR) refers to the percentage of the number of clicks on an advertisement compared to the number of times the advertisement is shown (impressions).


Client-Side refers to operations that are performed by the client in a client–server relationship in a computer network.


Cloaking refers to the practice in which the content presented to the search engines is different than that presented to human users.

Cloud Computing

Cloud Computing is the use of computing resources (computer hardware and computer software) that are delivered as a service over a network (typically the Internet).

Code Reuse

Code Reuse, also known as software reuse, is the use of existing software, or software knowledge, to build new software.


Coding is also known as computer programming.

Cost Per Impression

Cost Per Impression (CPI) refers to the cost of Internet marketing campaigns where advertisers pay for every time an ad is displayed, usually in the form of a banner ad on a website, but can also refer to advertisements in email marketing.


CMF is an acronym for Content Management Framework.


CMS is an acronym for Content Management System.

Comment Spam

Comment Spam, also known as social spam, or blog spam, is a form of spamdexing.

Communications Protocol

Communications Protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal description. Protocols may include signaling, authentication and error detection and correction capabilities.

Computational Linguistics

Computational Linguistics is an interdisciplinary field dealing with the statistical or rule-based modeling of natural language from a computational perspective.


Computer is a general purpose device that can be programmed to carry out a finite set of arithmetic or logical operations.

Computer Hardware

Computer Hardware is the collection of physical elements that comprise a computer system.

Computer Language

Computer Language is also known as programming language.

Computer Network

Computer Network is a collection of computers and other hardware interconnected by communication channels that allow sharing of resources and information.

Computer Program

Computer Program, also known as software, or program, is a sequence of instructions written to perform a specified task with a computer.

Computer Programming

Computer Programming, also known as programming or coding, is the process of designing, writing, testing, debugging, and maintaining the source code of computer programs.

Computer Science

Computer Science is the scientific and practical approach to computation and its applications.

Computer Software

Computer Software is also known as software.

Content Farm

Content Farm, also known as content mill, is a company that employs large numbers of often freelance writers to generate large amounts of textual content which is specifically designed to satisfy algorithms for maximal retrieval by automated search engines. Their main goal is to generate advertising revenue through attracting reader page views as first exposed in the context of social spam.

Content Management Framework

Content Management Framework (CMF) is a system that facilitates the use of reusable components or customized software for managing web content. It shares aspects of a web application framework and a content management system (CMS).

Content Management System

Content Management System (CMS) is a computer program that allows publishing, editing and modifying content as well as maintenance from a central interface. Such systems of content management provide procedures to manage workflow in a collaborative environment. These procedures can be manual steps or an automated cascade.

Content Marketing

Content Marketing is an umbrella term encompassing all marketing formats that involve the creation and sharing of content in order to attract, acquire and engage clearly defined and understood current and potential consumer bases with the objective of driving profitable customer action.

Content Negotiation

Content Negotiation is a mechanism defined in the HTTP specification that makes it possible to serve different versions of a document at the same URI, so that user agents can specify which version fit their capabilities the best.

Content Spam

Content Spam is a form of spamdexing, Content spam technique involves altering the logical view that a search engine has over the page's contents. They all aim at variants of the vector space model for information retrieval on text collections. Content spam techniques techniques can be classified into six classes: keyword stuffing, hidden text, meta-tag stuffing, doorway page, scraper site, and article spinning.

Content Syndication

Content Syndication, also known as web syndication, is a form of syndication in which content material is made available to multiple other content sources.

Contextual Advertising

Contextual Advertising is a form of targeted advertising for advertisements appearing on websites or other media, such as content displayed in mobile browsers. Such as Google AdSense is the major contextual advertising network.

Contingency Plan

Contingency Plan is a plan devised for an outcome other than in the usual (expected) plan.


Conversion is the act of converting a website visitor into a customer, or at least taking that visitor a step closer to customer acquisition.

Conversion Optimization

Conversion Optimization, also known as conversion rate optimization (CRO), is the process of increasing the conversion rate of a website or a landing page.

Conversion Rate

Conversion Rate is the ratio of visitors who convert casual content views or website visits into desired actions based on subtle or direct requests from marketers, advertisers, and content creators.

Conversion Rate Optimization

Conversion Rate Optimization (CRO) is the process of increasing the conversion rate of a website or a landing page.


Cookie, also known as HTTP cookie, web cookie, or browser cookie, is usually a small piece of data sent from a website and stored in a user's Web browser while a user is browsing a website. When the user browses the same website in the future, the data stored in the cookie can be retrieved by the website to notify the website of the user's previous activity.

Cookie Dropping

Cookie Dropping is also known as cookie stuffing.

Cookie Stuffing

Cookie Stuffing, also known as cookie dropping, is a black hat online marketing technique used to generate illegitimate revenue sharing from affiliate marketing.

Cost Per Action

Cost Per Action (CPA) is an online advertising pricing model, where advertisers pay for each specified action (a purchase, a form submission, and so on) linked to the advertisement.

Cost Per Click

Cost Per Click (CPC) is an online advertising model used to direct traffic to websites, where advertisers pay the publisher (typically a website owner) when the ad is clicked.

Cost Per Lead

Cost Per Lead (CPL) is an online advertising pricing model, where advertisers pay for each interested lead.


CPA is an acronym for Cost Per Action.


CPC is an acronym for Cost Per Click.


CPI is an acronym for Cost Per Impression.


CPL is an acronym for Cost Per Lead.

Crawl Rate

Crawl Rate refers to the speed of search engine crawler's requests during the crawl process.


Crawler is a computer program that gathers and categorizes information on the World Wide Web.

Crawler-based Search Engine

Crawler-based Search Engine is a search engine that uses crawlers to generate relevant search results.


Crawling is the process by which search engine discovers new and updated pages to be added to the search engine results pages.


CRM is an acronym for Customer Relationship Management.


CRO is an acronym for Conversion Rate Optimization.


CSS is an acronym for Cascading Style Sheets.


CTR is an acronym for Clickthrough Rate.

Customer Acquisition Cost

Customer Acquisition Cost (CAC) is calculated by dividing total acquisition costs by total new customers over a set period of time.

Customer Relationship Management

Customer Relationship Management (CRM) is a widely implemented model for managing a company's interactions with customers, clients, and sales prospects. It involves using technology to organize, automate, and synchronize business processes - principally sales activities, but also those for marketing, customer service, and technical support.


Cybersquatting, also known as domain squatting, according to the United States federal law known as the Anticybersquatting Consumer Protection Act, is registering, trafficking in, or using a domain name with bad faith intent to profit from the goodwill of a trademark belonging to someone else.

SEO Dictionary: List D

Dangling Link

Dangling Link refers to a link to a page that contains no other links.

Data Analysis

Data Analysis refers to a process of inspecting, cleaning, transforming, and modeling data with the goal of highlighting useful information, suggesting conclusions, and supporting decision making.


Database is a structured collection of data, which is typically organized to model relevant aspects of reality, in a way that supports processes requiring this information.

Database-Driven Website

Database-Driven Website is a website is connected to a database and web page content is based in part on information extracted from that database.

Database Management System

Database Management System (DBMS) a set of computer programs that not only enables you to store, modify, and extract information from a database, but also provides users with tools to add, delete, access, modify, and analyze data stored in one location.


Datalog is a truly declarative logic programming language that syntactically is a subset of Prolog.


DBMS is an acronym for Database Management System.

Dead Link

Dead Link is also known as broken link or dangling link.

Deep Linking

Deep Linking refers to the practice of making a hyperlink that points to a specific page or image on a website, instead of its main or home page.

Descriptive Metadata

Descriptive Metadata is a type of metadata that describes an information resource for identification and retrieval through elements such as title, author, and abstract.

Display Advertising

Display Advertising is a type of advertising that typically contains text, logos, photographs or other images, location maps, and similar items.


DKI is an acronym for Dynamic Keyword Insertion.


DNS is an acronym for Domain Name System.

DNS Hijacking

DNS Hijacking, also known as DNS redirection, refers to the practice of subverting the resolution of Domain Name System (DNS) queries.

DNS Redirection

DNS Redirection is also known as DNS Hijacking.

Document Object Model

Document Object Model (DOM) is a cross-platform and language-independent convention for representing and interacting with objects in HTML, XHTML, and XML documents.


DOM is an acronym for Document Object Model.

Domain Engineering

Domain Engineering, also known as product line engineering, is the entire process of reusing domain knowledge in the production of new software systems.

Domain Forwarding

Domain Forwarding is also known as Domain Redirection.

Domain Name

Domain Name is an identification string that defines a realm of administrative autonomy, authority, or control on the Internet.

Domain Name System

Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network.

Domain Redirection

Domain Redirection, also known as domain forwarding, refers to that all pages in a URL domain are redirected to a different domain.

Domain-Specific Language

Domain-Specific Language is a programming language or specification language dedicated to a particular problem domain, a particular problem representation technique, and/or a particular solution technique.

Domain Squatting

Domain Squatting is known as Cybersquatting.

Doorway Page

Doorway Page, also known as bridge page, portal page, jump page, gateway page, or entry page, is a technique that creating web pages for spamdexing, this is, for spamming the index of a search engine by inserting results for particular phrases with the purpose of sending visitors to a different page. Doorway page that redirect visitors without their knowledge use some form of cloaking. Doorway pages are typically large sets of poor-quality pages where each page is optimized for a specific keyword or phrase.


Drupal is a free and open source content management system (CMS) and content management framework (CMF) written in PHP and distributed under the GNU General Public License.

Duplicate Content

Duplicate Content refers to content that appears on more than one web page or website. The website that contains the duplicate content can be penalised or ceased displaying in any relevant search results by the search engines such as Google.

Dynamic Keyword Insertion

Dynamic Keyword Insertion (DKI) is a feature provided by Google AdWords, Bing Ads, and Yahoo! Search Marketing to dynamically insert a keyword that is most relevant to the ad to be displayed.

Dynamic Web Page

Dynamic Web Page is a web page that is generated at the time of access by a user or change as a result of interaction with the user.

SEO Dictionary: List E


E-Commerce is also known as electronic commerce or ecommerce.


E-Mail is also known as electronic mail, or email.


ECMAScript is the scripting language standardized by Ecma International in the ECMA-262 specification and ISO/IEC 16262. ECMAScript is widely used for client-side scripting on the web, in the form of several well-known dialects such as JavaScript, JScript, and ActionScript.


Ecommerce is also known as electronic commerce or e-commerce.

Electronic Commerce

Electronic Commerce, commonly known as e-commerce or ecommerce, is the buying and selling of product or service over electronic systems such as the Internet and other computer networks.

Electronic Customer Relationship Marketing

Electronic Customer Relationship Marketing (ECRM) is enterprises using IT to integrate internal organization resources and external marketing strategies to understand and fulfill their customers needs.

Eigenvalue Algorithm

Eigenvalue Algorithm is designing efficient and stable algorithms for finding the eigenvalues of a matrix.

Electronic Mail

Electronic Mail, also know as email, or e-mail.


Email, also known as electronic mail, or e-mail, is a method of exchanging digital messages from an author to one or more recipients.

Email CTR

Email CTR is defined as the number of recipients who clicked one or more links in an email and landed on the sender's website, blog, or other desired destination.

Email Marketing

Email Marketing is directly marketing a commercial message to a group of people using email.

Entry Page

Entry Page is also known as doorway page, bridge page, portal page, jump page, or gateway page.

Euler Diagram

Euler Diagram is a diagrammatic means of representing sets and their relationships.

Extensible Hypertext Markup Language

Extensible Hypertext Markup Language (XHTML) is a family of XML markup languages that mirror or extend versions of the widely used Hypertext Markup Language (HTML), the language in which web pages are written.

Extensible Markup Language

Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.

Extensible Messaging and Presence Protocol

Extensible Messaging and Presence Protocol (XMPP) is a communications protocol for message-oriented middleware based on XML (Extensible Markup Language).

External Link

External Link is a hyperlink that is a reference or navigation element in a document to another document outside the same website or domain of the Internet. Generally, a link that points to a page outside the same domain is an external link.

SEO Dictionary: List F


Facebook is a social networking service that is owned and operated by Facebook, Inc.


FCF is an acronym for First Click Free.


FFA is an acronym for Free-For-All.

First Click Free

First Click Free is a way for publishers to allow search engine to access their subscription-only or restricted content but not others so that search engine can crawl and index the subscription-only or restricted content successfully.


Flickr is an image hosting and video hosting website, web services suite, and online community that is owned by Yahoo!.

Florida Update

Florida Update is an update to Google's search engine ranking algorithms. It is similar in scope to the Big Daddy update.

Forum Signature Linking

Forum Signature Linking is a search engine optimization technique used to build backlinks to a website.


Free-For-All is a disorganized or unrestricted situation or event in which everyone may take part.

FFA Page

FFA Page, also known as link farm, is a page with many outgoing links to unrelated websites, containing little if any unique content.

FFA Site

FFA Site is also known as link farm, is a site with many outgoing links to unrelated websites, containing little if any unique content.

Functional Programming

Functional Programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids state and mutable data. It emphasizes the application of functions, in contrast to the imperative programming style, which emphasizes changes in state.

SEO Dictionary: List G

Gateway Page

Gateway Page is also known as doorway page, bridge page, portal page, jump page, or entry page.

General-Purpose Programming Language

General-Purpose Programming Language is a programming language designed to be used for writing software in a wide variety of application domains.


Geotargeting is the method of determining the geolocation of a website visitor and delivering different content to that visitor based on his or her location, such as country, region/state, city, metro code/zip code, organization, IP address, ISP or other criteria.


Gmail is a free, advertising-supported email service provided by Google


Google is an American multinational internet corporation which provides its well-known search engine (Google Search), software, cloud computing, and other Internet-related products and services, including YouTube, Gmail, Google+, Google AdSense, Google AdWords, Google Analytics, Google Maps, Google Earth and more.


Google+ is a multilingual social networking and identity service owned and operated by Google.

Google AdSense

Google AdSense is a program run by Google that allows publishers in the Google Network of content sites to serve automatic text, image, video, and rich media adverts that are targeted to site content and audience.

Google AdWords

Google AdWords is a online advertising product offered by Google that offers cost per click (CPC) advertising, cost per mille (CPM) advertising, and site-targeted advertising for text, banner, and rich-media ads.

Google Analytics

Google Analytics is a analytics tool and service offered by Google that generates detailed statistics about the visits to a website.

Google Bomb

Google Bomb is a black hat SEO technique that creats large numbers of links to achieve a high ranking on selected keywords (often unrelated or off topic keywords)

Google Bowling

Google Bowling is a black hat SEO technique that points large numbers of questionable links from low-quality sites at a competitor's website to knock competitors down in, or out of, the search engine results.

Google Chrome

Google Chrome is a Web browser developed by Google that uses the WebKit layout engine.

Google Earth

Google Earth is a virtual globe, map and geographical information program run by Google

Google Maps

Google Maps, formerly Google Local, is a web mapping service application and technology provided by Google

Google PageRank

Google PageRank is a link analysis algorithm used by the Google search engine, that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the WWW, with the purpose of "measuring" its relative importance within the set. More information at .

Google Panda

Google Panda is a Google search engine algorithm update that was first announced on February 2011, and is aimed at decreasing search engine rankings of low-quality sites or thin sites, and returning higher-quality sites near the top of the search results.

Google Penalty

Google Penalty refers to a negative impact on a website's search engine ranking based on updates to Google's search engine algorithms. The penalty can be an unfortunate by-product, or an intentional penalization of various black hat SEO techniques.

Google Penguin

Google Penguin is a Google search engine algorithm update that was first announced on April 24, 2012, and is aimed at decreasing search engine rankings of websites that violate Google's Webmaster Guidelines by using now declared black hat SEO techniques, such as keyword stuffing, cloaking, participating in link schemes, deliberate creation of duplicate content, and others.

Google Sandbox

Google Sandbox is one of Google search engine algorithms which are trying to prevent the spam websites from quickly reaching high in the search engine results pages. Google Sandbox is the virtual "purgatory" that many newly launched sites must pass through in order to rank well in Google search engine. More information at .

Google Search

Google Search is a web search engine owned by Google

Google Webmaster Guidelines

Google Webmaster Guidelines is the best practices and guidelines to help Google find, crawl, and index your site.


Googlebot is the search engine Bot program that Google uses to crawl the web to build a searchable index for Google Search.

Graph Theory

Graph Theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects from a certain collection.

Graphical User Interface

Graphical User Interface (GUI) is a type of user interface that allows users to interact with electronic devices using images rather than text commands.

Grey Hat

Grey Hat is a combination of a Black Hat and a White Hat.


Greylist is a basic access control mechanism that are temporarily blocked or temporarily allowed. A greylist is a combination of a blacklist and a whitelist.

Guerrilla Marketing

Guerrilla Marketing is an advertising strategy in which low-cost unconventional means (graffiti, sticker bombing, flash mobs) are utilized, often in a localized fashion or large network of individual cells, to convey or promote a product or an idea.


GUI is an acronym for Graphical User Interface.

SEO Dictionary: List H

Hallway Page

Hallway Page is used to index to a group of pages that you would like the search engine spiders to find. Once a search engine spider indexes the hallway page, it should also follow all the links on that hallway page and in turn index those pages as well.

Hand Phone

Hand Phone is also known as mobile phone, cellular phone, or cell phone.

Hidden Text

Hidden Text is a form of content spam technique that computer text is displayed in such a way as to be invisible or unreadable. Hidden text is most commonly achieved by setting the font color to the same color as the background, rendering the text invisible unless the user highlights it.


HTML is an acronym for Hypertext Markup Language.


HTML5 is an acronym for Hypertext Markup Language 5.


HTTP is an acronym for Hypertext Transfer Protocol.

HTTP Cookie

HTTP Cookie is also known as cookie, web cookie, or browser cookie.

HTTP Status Codes

HTTP Status Codes are numeric codes that provide information regarding the state of an HTTP request. More information at .

HITS Algorithm

HITS Algorithm is an acronym for Hyperlink-Induced Topic Search Algorithm.

Hybrid Search Engine

Hybrid Search Engine is a type of search engine that use the unification of a variety of results including organic spidered results, directory results, news results, and product results.


Hyperlink, also known as link, is a reference to data that the reader can directly follow, or that is followed automatically. A hyperlink points to a whole document or to a specific element within a document. Hypertext is text with hyperlinks. A software system for viewing and creating hypertext is a hypertext system, and to create a hyperlink is to hyperlink (or simply to link). A user following hyperlinks is said to navigate or browse the hypertext.

Hyperlink-Induced Topic Search Algorithm

Hyperlink-Induced Topic Search Algorithm (HITS Algorithm) is a link analysis algorithm that rates Web pages, developed by Jon Kleinberg. It was a precursor to PageRank. The idea behind Hubs and Authorities stemmed from a particular insight into the creation of web pages when the Internet was originally forming; that is, certain web pages, known as hubs, served as large directories that were not actually authoritative in the information that it held, but were used as compilations of a broad catalog of information that led users directly to other authoritative pages. In other words, a good hub represented a page that pointed to many other pages, and a good authority represented a page that was linked by many different hubs. The scheme therefore assigns two scores for each page: its authority, which estimates the value of the content of the page, and its hub value, which estimates the value of its links to other pages.


Hypertext is text displayed on a computer or other electronic device with references (hyperlinks) to other text that the reader can immediately access, usually by a mouse click, keypress sequence or by touching the screen. Apart from running text, hypertext may contain tables, images and other presentational devices. Hypertext is the underlying concept defining the structure of the World Wide Web. It is an easy-to-use and flexible format to share information over the Internet.

Hypertext Markup Language

Hypertext Markup Language (HTML) is the main markup language for displaying web pages and other information that can be displayed in a Web browser.

Hypertext Markup Language 5

Hypertext Markup Language 5 (HTML5) is the fifth revision of the HTML standard. HTML5 is a markup language for structuring and presenting content for the World Wide Web and a core technology of the Internet.

Hypertext System

Hypertext System is a software system for viewing and creating hypertext.

Hypertext Transfer Protocol

Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web.

SEO Dictionary: List I


IAB is an acronym for Interactive Advertising Bureau.


IDE is an acronym for Integrated Development Environment.


IE is an acronym for Internet Explorer.

If-Modified-Since HTTP Header

If-Modified-Since HTTP Header is sent from an user agent (browser/bot) to the Web server in order to know if the requested page has been changed since its last visit.


IM is an acronym for Instant Messaging.

Image Map

Image Map is a list of coordinates relating to a specific image, created in order to hyperlink areas of the image to various destinations (as opposed to a normal image link, in which the entire area of the image links to a single destination).

Imperative Programming

Imperative Programming is a programming paradigm that describes computation in terms of statements that change a program state. In much the same way that imperative mood in natural languages expresses commands to take action, imperative programs define sequences of commands for the computer to perform.

Inbound Link

Inbound Link is also known as Backlink.

Incoming Link

Incoming Link is also known as Backlink.

Index Sequential Access Mode

Index Sequential Access Mode is a method for indexing data for fast retrieval.

Information Architecture

Information Architecture is the art and science of organizing and labelling websites, intranets, online communities and software to support usability.

Information Retrieval

Information Retrieval (IR) is the activity of obtaining information resources relevant to an information need from a collection of information resources.

Information Technology

Information technology (IT) is concerned with the development, management, and use of computer-based information systems.

Instant Messaging

Instant Messaging (IM) is a form of communication over the Internet, that offers quick transmission of text-based messages from sender to receiver.

Integrated Development Environment

Integrated Development Environment (IDE) is a software application that provides comprehensive facilities to computer programmers for software development. An IDE normally consists of a source code editor, build automation tools, and a debugger.

Interactive Advertising Bureau

Interactive Advertising Bureau (IAB) is an advertising business organization that develops industry standards, conducts research, and provides legal support for the online advertising industry.


Interlinking is a linking structure of various web pages within a site that helps users and crawlers navigate its content.

Internal Link

Internal Link is a hyperlink that is a reference or navigation element in a document to another section of the same document or to another document that may be on or part of the same website or domain of the Internet. Generally, a link that points to a page within the same domain is an internal link.


Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (often called TCP/IP, although not all applications use TCP) to serve billions of users worldwide.

Internet Explorer

Internet Explorer (IE) is a Web browser developed by Microsoft and included as a part of the Microsoft Windows operating system.

Internet Forum

Internet Forum is an online discussion site where people can hold conversations in the form of posted messages.

Internet Marketing

Internet Marketing, also known as web marketing, online marketing, webvertising, or e-marketing, is referred to as the marketing (generally promotion) of products or services over the Internet.

Internet Service Provider

Internet Service Provider (ISP) is an organization that provides access to the Internet.

Internet Protocol

Internet Protocol (IP) is the principal communications protocol used for relaying datagrams (also known as network packets) across an internetwork using the Internet Protocol Suite responsible for routing packets across network boundaries. It is the primary protocol that establishes the Internet.

Internet Protocol Suite

Internet Protocol Suite, commonly known as TCP/IP, is the set of communications protocol used for the Internet and similar networks, and generally the most popular protocol stack for wide area networks.

Invisible On-page Factors

Invisible On-page Factors are the on-page factors that are invisible to the vistors. More information at .

Inward Link

Inward Link is also known as Backlink.

Inline Linking

Inline Linking, also known as hotlinking, leeching, piggy-backing, direct linking, offsite image grabs, or bandwidth theft, refers to the practice of using a linked object, often an image, from one site by a web page belonging to a second site.


Inlink is also known as Backlink.


iOS, previously iPhone OS, is a mobile operating system developed and distributed by Apple Inc. Originally released in 2007 for the iPhone and iPod Touch, it has been extended to support other Apple devices such as the iPad and Apple TV.


IP is an acronym for Internet Protocol.


iPad is a line of tablet computers designed and marketed by Apple Inc. and runs iOS mobile operating system.


iPhone is a line of smartphones designed and marketed by Apple Inc. and runs iOS mobile operating system.

iPod Touch

iPod Touch is a portable media player, personal digital assistant, handheld game console, and Wi-Fi mobile device designed and marketed by Apple Inc. and runs iOS mobile operating system.


IR is an acronym for Information Retrieval.


ISAM is an acronym for Index Sequential Access Mode.


ISP is an acronym for Internet Service Provider.


IT is an acronym for Information Technology.

SEO Dictionary: List J


Jabber is the original name of the Extensible Messaging and Presence Protocol (XMPP), the open technology for instant messaging and presence. is the public, free instant messaging and presence service based on the XMPP protocol.


JavaScript (sometimes abbreviated JS) is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles. JavaScript was formalized in the ECMAScript language standard and is primarily used in the form of client-side JavaScript, implemented as part of a Web browser in order to create enhanced user interfaces and dynamic websites. This enables programmatic access to computational objects within a host environment.

JavaScript Object Notation

JavaScript Object Notation (JSON) is a text-based open standard designed for human-readable data interchange. It is derived from the JavaScript scripting language for representing simple data structures and associative arrays, called objects. Despite its relationship to JavaScript, it is language-independent, with parsers available for many programming paradigm.


Joomla is a free and open source content management system (CMS) for publishing content on the World Wide Web and intranets and a model-view-controller (MVC) web application framework (WAF) that can also be used independently. Joomla is written in the PHP programming language and uses a backend database (such as MySQL).


JS is an acronym for JavaScript.


JScript is Microsoft's dialect of the ECMAScript standard that is used in Microsoft's Internet Explorer. JScript is implemented as a Windows Script engine. This means that it can be "plugged in" to any application that supports Windows Script, such as Internet Explorer, Active Server Pages, and Windows Script Host. It also means that any application supporting Windows Script can use multiple languages (JScript, VBScript, Perl, and others).


JSON is an acronym for JavaScript Object Notation.

Jump Page

Jump Page is also known as doorway page, bridge page, portal page, gateway page, or entry page.

SEO Dictionary: List K


KEI is an acronym for Keyword Effectiveness Index.

Key Performance Indicator

Key Performance Indicator (KPI) is an industry jargon for a type of performance measurement that is commonly used by an organization to evaluate its success or the success of a particular activity in which it is engaged.


Keyword is a word or phrase that you type on a computer keyboard in order to find information about a particular subject, or a search engine user might use to find relevant web pages.

Keyword Cannibalization

Keyword Cannibalization refers to the excessive reuse of the same keywords on too many web pages within the same website.

Keyword Density

Keyword Density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page.

Keyword Effectiveness Index

Keyword Effectiveness Index (KEI) is a mathematical representation of the number of searches for a keyword compared to the number of search results. The higher the KEI, the more popular the keywords are, and the less competition it have. That means that you might have a better chance of the keywords ranking on the first page of the search results.

Keyword Popularity

Link Popularity is a general representation of the total number of searches for a given keyword during a period of time.

Keyword Prominence

Keyword Prominence refers to the prominent placement of keywords or phrases within a Web page.

Keyword Proximity

Keyword Proximity refers to how close two or more keywords are to each other in page copy. It is used by search engines to measure relevancy of a given page to the search request.

Keyword Stemming

Keyword Stemming refers to the process for reducing inflected (or sometimes derived) keywords to their stem, base, or root form. It is used by search engines to understand different plurality and tenses of a keyword.

Keyword Stuffing

Keyword Stuffing refers to the practice of loading a webpage with keywords or numbers in an attempt to manipulate a site's ranking in a search engine results page.


Knowledge is information and understanding about a subject which a person has, or which all people have.

Knowledge Representation

Knowledge Representation (KR) is an area of artificial intelligence research aimed at representing knowledge in symbols to facilitate inferencing from those knowledge elements, creating new elements of knowledge.


KPI is an acronym for Key Performance Indicator.


KR is an acronym for Knowledge Representation.

SEO Dictionary: List L

Landing Page

Landing Page is a single web page that appears in response to clicking on an organic search result or an online advertisement.

Landing Page Optimization

Landing Page Optimization (LPO) is the process of affecting the visibility of a landing page in an organic search result, and improving the percentage of visitors that become sales leads and customers.

Latent Semantic Analysis

Latent Semantic Analysis (LSA) is a technique in natural language processing, in particular in vectorial semantics, of analyzing relationships between a set of documents and the terms they contain by producing a set of concepts related to the documents and terms.

Layout Engine

Layout Engine is also known as web browser engine or rendering engine.


Linguistics is the systematic study of the structure and development of language in general or of particular languages, including language form, language meaning, and language in context.


Link is also known as hyperlink.

Link Analysis

Link Analysis is a data analysis technique used to evaluate relationships (connections) between nodes.

Link Bait

Link Bait is any content or feature, within a website, designed specifically to gain attention or encourage others to link to the website. More information at .

Link Breaking

Link Breaking is also known as link rot, linkrot, or link death.

Link Building

Link Building is the practice of actively marketing your site with the intent to obtain links from other sites. It is not only a fundamental part of SEO, but also an ongoing part of marketing your website. More information at .

Link Death

Link Death is also known as link rot, linkrot, or link breaking.

Link Doping

Link Doping refers to the practice and effects of embedding a large number of hyperlinks on a website in exchange for return links, especially when used to inflate the apparent popularity of the website.

Link Equity

Link Equity ​refers to the search engine's measure of the value of a web page based on the quality and quantity of inbound links to the page.

Link Exchange

Link Exchange is a confederation of websites that operates similarly to a webring.

Link Farm

On the World Wide Web, a link farm is any group of web sites that all hyperlink to every other site in the group. Although some link farms can be created by hand, most are created through automated programs and services. A link farm is a form of spamming the index of a search engine (sometimes called spamdexing or spamexing).

Link Juice

Link Juice refers to the power that can be given to a website by obtaining quality backlinks.

Link Popularity

Link Popularity is a search engine optimization terminology that describes the popularity value of a particular website, where the measurement is based upon the quantity and quality of sites that link to it. More information at .

Link Rot

Link Rot is also known as linkrot, link death, or link breaking.

Link Spam

Link Spam is defined as links between pages that are present for reasons other than merit. Link spam takes advantage of link-based ranking algorithms (such as HITS algorithm), which gives websites higher rankings the more other highly ranked websites links to it.

Linked Data

Linked Data is a a method of publishing structured data so that it can be interlinked and become more useful. It builds upon standard Web technologies such as HTTP and URI, but rather than using them to serve web pages for human readers, it extends them to share information in a way that can be read automatically by computers.


Linkback is a method for Web authors to obtain notifications when other authors link to one of their documents. There are three types of linkbacks which include refback, trackback, and pingback.


LinkedIn is a social networking website for people in professional occupations.


Linkrot is also known as link rot, link death, or link breaking.


Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution.

Logic Programming

Logic Programming is one of the four main programming paradigms. Its theory of computation is based on first order logic. Programming languages such as Prolog and Datalog implement it.


LPO is an acronym for Landing Page Optimization.


LSA is an acronym for Latent Semantic Analysis.

SEO Dictionary: List M


Malware, is short for malicious software.

Malicious Software

Malicious Software is software used or created to disrupt computer operation, gather sensitive information, or gain access to private computer systems.


Marketing refers to the process of communicating the value of a product or service to customers.

Marketing Budget

Marketing Budget refers to a financial plan for the marketing of a product or product range for a specified period of time.

Markov Chain

Markov Chain is a mathematical system that undergoes transitions from one state to another, between a finite or countable number of possible states.

Markup Language

Markup Language is a modern system for annotating a document in a way that is syntactically distinguishable from the text. Some markup languages, such as HTML, have pre-defined presentation semantics, meaning that their specification prescribes how the structured data are to be presented; others, such as XML, do not.

Massachusetts Institute of Technology

Massachusetts Institute of Technology (MIT) is a private research university located in Cambridge, Massachusetts, United States. MIT has five schools and one college, containing a total of 32 academic departments, with a strong emphasis on scientific and technological education and research.


Matrix is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns.


MCF is an acronym for Meta Content Framework.


MDE is an acronym for Model-Driven Engineering.


MDA is an acronym for Model Driven Architecture.


MediaWiki is a free web-based wiki software application developed by the Wikimedia Foundation and written in the PHP programming language and uses a backend database.

Message Board

Message Board is also known as Internet Forum.

Meta Content Framework

Meta Content Framework (MCF) is a specification of a format for structuring metadata about web sites and other data.

Meta Description Tag

Meta Description Tag is an HTML or XHTML meta element used to provide a concise explanation of the content of a given Web page. It gives search engines a summary of what the page is about.

Meta Element

Meta Element is an HTML or XHTML element used to provide structured metadata about a Web page.

Meta Refresh

Meta Refresh is a legacy method of instructing a Web browser to automatically refresh the current web page or frame after a given time interval, using an HTML meta element with the http-equiv parameter set to "refresh" and a content parameter giving the time interval in seconds.

Meta Search Engine

Meta Search Engine, also known as metasearch engine, is a search engine that uses multiple search engine crawlers or databases to generate relevant search results, thereby improving the quality of the search results.

Meta Tag

Meta Tag is also known as Meta Element.


Metacontent is also known as Metadata.


Metadata, also known as metacontent, is is defined as data providing information about one or more aspects of the data, such as means of creation of the data, purpose of the data, time and date of creation, creator or author of data, location on a computer network where the data was created, and standards used.

Metadata Syntax

Metadata Syntax refers to the rules created to structure the fields or elements of metadata.

Metasearch Engine

Metasearch Engine is also known as Meta Search Engine.


Microblogging is a broadcast medium in the form of blogging. A microblog (such as Twitter) differs from a traditional blog in that its content is typically smaller in both actual and aggregate file siz.


Microdata is a WHATWG HTML specification used to nest semantics within existing content on web pages. search engines, web crawlers, and web browsers can extract and process Microdata from a web page and use it to provide a richer browsing experience for users. Microdata uses a supporting vocabulary to describe an item and name-value pairs to assign values to its properties. Microdata helps technologies such as search engines and web crawlers better understand what information is contained in a web page, providing better search results. Microdata is an attempt to provide a simpler way of annotating HTML elements with machine-readable tags than the similar approaches of using RDFa and Microformats.


Microformat is a web-based approach to semantic markup which seeks to re-use existing HTML/XHTML tags to convey metadata and other attributes in web pages and other contexts that support HTML/XHTML, such as RSS. This approach allows software to process information intended for end-users (such as contact information, geographic coordinates, calendar events, and the like) automatically. Microformats allow the encoding and extraction of events, contact information, social relationships and so on. Established microformats are published on the web more than alternatives like schema and RDFa.


Microsoft Corporation is an American multinational corporation that develops, manufactures, licenses and supports a wide range of products and services related to computing.

Microsoft Windows

Microsoft Windows is a series of graphical user interface operating systems developed, marketed, and sold by Microsoft.


MIT is an acronym for Massachusetts Institute of Technology.

Mobile Advertising

Mobile Advertising is a form of advertising via mobile devices. It is a subset of mobile marketing.

Mobile Device

Mobile Device, also known as a handheld device, handheld computer, or simply handheld, is a small, hand-held computing device.

Mobile Marketing

Mobile Marketing is marketing on or with a mobile device.

Mobile Operating System

Mobile Operating System is the operating system that operates a smartphone, tablet, PDA, or other digital mobile devices.

Mobile Phone

Mobile Phone, also known as cellular phone, cell phone, or hand phone, is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area.

Model Driven Architecture

Model Driven Architecture (MDA) is a model-driven domain engineering software design approach for the development of software systems. It was launched by the Object Management Group in 2001. More information at .

Model-Driven Engineering

Model-Driven Engineering (MDE) is a software development methodology which focuses on creating and exploiting domain models rather than on the computing concepts.


Model-View-Controller (MVC) is an architecture that separates the representation of information from the user's interaction with it. Its core concept is code reuse and separation of concerns.


Monetization refers to the act or process of converting into money, or of adopting as money.


Mousetrapping is a technique used by some websites (usually adult-oriented websites) in which the "Back" and "Exit" buttons of a visitor's Web browser are disabled and attempts to leave the website are redirected to the specific pages on the website or the other websites against the visitor's will. One way to end the cycle of mousetrapping may be to use keyboard shortcuts (like Alt+F4 in Windows) instead of the mouse to close the windows, or press "Ctrl+Alt+Del" to end the task, or reboot the computer if that fails.


Mozilla is a free software community best known for producing the Mozilla Firefox Web browser.

Mozilla Corporation

Mozilla Corporation is a non-profit organization that exists to support and lead the open source Mozilla project.

Mozilla Firefox

Mozilla Firefox is a free and open source Web browser developed for Microsoft Windows, OS X, and Linux, coordinated by Mozilla Corporation and Mozilla Foundation.

Mozilla Foundation

Mozilla Foundation is a non-profit organization that exists to support and lead the open source Mozilla project.


MVC is an acronym for model-view-controller.


MySpace is a social networking service owned by Specific Media LLC and pop music singer and actor Justin Timberlake.


MySQL is the world's most used open source relational database management system (RDBMS) as of 2008 that runs as a server providing multi-user access to a number of databases. The MySQL development project has made its source code available under the terms of the GNU General Public License, as well as under a variety of proprietary agreements. MySQL was owned and sponsored by Oracle Corporation.

SEO Dictionary: List N

Natural Language Processing

Natural Language Processing (NLP) is a field of computer science, artificial intelligence, and linguistics concerned with the interactions between computers and human (natural) languages.

Network Theory

Network Theory is an area of computer science and network science and part of graph theory.

Niche Market

Niche Market is the subset of the market on which a specific product is focusing.

Niche Marketing

Niche Marketing is a form of marketing on which a very specific demographic is targeting.


NLP is an acronym for Natural Language Processing.

SEO Dictionary: List O

Object Management Group

Object Management Group (OMG) is an international, open membership, not-for-profit computer industry standards consortium.

Object-Oriented Programming

Object-Oriented Programming (OOP) is a programming paradigm using "objects" - usually instances of a class - consisting of data fields and methods together with their interactions - to design applications and computer programs. OOP techniques may include features such as data abstraction, encapsulation, messaging, modularity, polymorphism, and inheritance.

Off-Page SEO

Off-Page SEO refers the SEO process that you perform to increase your website's popularity, rank, and traffic via the off-page factors that have an effect on your Web site or Web page listing in natural search results. More information at .


OMG is an acronym for Object Management Group.

On-Page Factor

On-Page Factor refers to the criteria of a web page that are dictated by the contents of a web page itself.

On-Page SEO

On-Page SEO refers the SEO process that you apply to website pages and files to make them search engine optimized and apply to help search crawlers index them more efficiently, which in turn displays them in a higher position in the search result pages. More information at .

Online Advertising

Online Advertising is a form of promotion that uses the Internet and World Wide Web to deliver marketing messages to attract customers.

Online Content Syndication

Online Content Syndication is a system or method in which online publishers republish articles, news items, press releases, blog posts, videos, or any other form of original material through various social media and Internet marketing channels. More information at .


Ontology is the branch of philosophy that represents knowledge as a set of concepts within a domain, and the relationships between pairs of concepts.


OOP is an acronym for Object-Oriented Programming.

Open Directory Project

Open Directory Project is the largest, most comprehensive human-edited directory of the World Wide Web. It is constructed and maintained by a vast, global community of volunteer editors.

Open Rate

Open Rate refers to the number of people who actually opened the email sent to them, giving the company insight in to how effective the email marketing campaign was.

Open Source

Open Source is a philosophy, or pragmatic methodology that promotes free redistribution and access to an end product's design and implementation details.

Operating System

Operating System (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs.

Optimality Theory

Optimality Theory (OT) is a linguistic model proposing that the observed forms of language arise from the interaction between conflicting constraints.

Organic Search Result

Organic Search Result is a listing on search engine results page (SERP) that appears because of its relevance to the search terms, as opposed to its being advertisements. In contrast, non-organic search results may include pay per click advertising.


OS is an acronym for Operating System.


OS X, originally Mac OS X, is a series of Unix-based graphical interface operating systems developed, marketed, and sold by Apple Inc.


OT is an acronym for Optimality Theory.


OWL is an acronym for Web Ontology Language.

SEO Dictionary: List P


P2P is an acronym for Peer-To-Peer.

Page Clickthrough Rate

Page Clickthrough Rate (CTR) is the number of ad clicks divided by the number of page views.


Pagejacking is a form of spamdexing that creats a rogue copy of a popular website which shows contents similar to the original to a Web crawler, but redirects web surfers to separate, unrelated or malicious websites.


PageRank is a link analysis algorithm, named after Larry Page and used by the Google Internet search engine, that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. More information at .

Palmtop Computer

Palmtop Computer is also known as a personal digital assistant or personal data assistant.


PDA is an acronym for Personal Digital Assistant.


Peer-To-Peer (P2P) computer network is one in which each computer in the network can act as a client or server for the other computers in the network, allowing shared access to various resources such as files, peripherals, and sensors without the need for a central server.

Performance-Based Advertising

Performance-Based Advertising is a form of advertising in which the purchaser pays only when there are measurable results.

Performance Measurement

Performance Measurement is a process for collecting and reporting information regarding the performance of an individual, group or organizations.


Peripheral is a device that is connected to a host computer, but not part of it.

Personal Data Assistant

Personal Data Assistant is also known as a personal digital assistant or palmtop computer.

Personal Digital Assistant

Personal Digital Assistant, also known as a palmtop computer, or personal data assistant, is a mobile device that functions as a personal information manager.

Personalized Search

Personalized Search refers to search experiences that are tailored specifically to an individual's interests by incorporating information about the individual beyond specific query provided.


PHP is a general-purpose server-side scripting language originally designed for Web development to produce dynamic web pages.


Pingback is one of three types of linkback methods for Web authors to request notification when somebody links to one of their documents.

Portable Operating System Interface

Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE for maintaining compatibility between operating systems.

Portal Page

Portal Page is also known as doorway page, bridge page, jump page, gateway page, or entry page.


POSIX is an acronym for Portable Operating System Interface.


PostgreSQL is an open source object-relational database management system (RDBMS) available for many operating system platforms including Linux, FreeBSD, Solaris, Microsoft Windows, and OS X.

Preferred Domain

Preferred Domain, sometimes referred to as the canonical domain, is the domain that the webmaster would liked used to index the site's pages.

Product Line Engineering

Product Line Engineering is also known as Domain Engineering.

Programming Language

Programming Language is an artificial language designed to communicate instructions to a machine, particularly a computer.

Programming Paradigm

Programming Paradigm is a fundamental style of computer programming. There are four main paradigms: object-oriented, imperative, functional, and logic programming.


Prolog is a general-purpose logic programming language associated with artificial intelligence and computational linguistics.


Protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications.

SEO Dictionary: List Q

QR Algorithm

QR Algorithm is an eigenvalue algorithm that is a procedure to calculate the eigenvalues and eigenvectors of a matrix.

QR Decomposition

QR Decomposition of a matrix is a decomposition of a matrix A into a product A=QR of an orthogonal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares problem, and is the basis for a particular eigenvalue algorithm, the QR algorithm.

SEO Dictionary: List R


RDBMS is an acronym for relational database management system.


RDF is an acronym for Resource Description Framework.

RDF Schema

RDF Schema refers to a set of classes with RDF extensible knowledge representation language, providing basic elements for the description of ontologies, intended to structure RDF resources.


RDFa is an acronym for Resource Description Framework in Attributes.

Reciprocal Link

Reciprocal Link is a mutual link between two objects, commonly between two websites to ensure mutual traffic. Google and other search engines now do not give credit to reciprocal linking as it does not indicate genuine link popularity.


Refback is one of three types of linkback methods for Web authors to request notification when somebody links to one of their documents.

Relational Database Management System

Relational Database Management System (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd at IBM's San Jose Research Laboratory. Most popular databases currently in use are based on the relational database model.

Relative Link

Relative Link, in contrast with a absolute link, is a link that specifies the location of a web page relative to your current location.


Relevance refers to the ability (as of an information retrieval system) to retrieve material that satisfies the needs of the user.


Relevancy is the measurement of the theoretical distance between two corresponding items with regards to relationship.

Rendering Engine

Rendering Engine is also known as web browser engine or layout engine.

Resource Description Framework

Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications originally designed as a metadata data model. It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax formats.

Resource Description Framework in Attributes

Resource Description Framework in Attributes (RDFa) is a W3C recommendation that adds a set of attribute-level extensions to HTML, XHTML and various XML-based document types for embedding rich metadata (or rich snippets) within Web documents.

Resource Link

Resource Link is a hyperlink to a website or a specific web page containing content believed to be beneficial, useful and relevant to visitors of the site establishing the link.

Revenue Sharing

Revenue Sharing refers to the sharing of profits and losses among different groups.

Rewrite Engine

Rewrite Engine is software located in a web application framework running on a web server that modifies a web URL's appearance.

Rich Snippets

Rich Snippets are a new presentation of snippets that applies Google search engine's algorithms to highlight structured data embedded in web pages.

Robot Exclusion Protocol

Robot Exclusion Protocol is also known as Robot Exclusion Standard.

Robot Exclusion Standard

Robot Exclusion Standard, also known as robot exclusion protocol or robots.txt protocol is a convention to prevent cooperating Web crawlers and other Web robots from accessing all or part of a website which is otherwise publicly viewable.

Robots.txt Protocol

Robots.txt Protocol is also known as Robot Exclusion Standard.

Run-Time System

Run-Time System, also known as runtime environment, runtime system, or runtime, is a software component designed to support the execution of computer programs written in some computer language.


Runtime is also known as run-time system, runtime environment, or runtime system.

Runtime Environment

Runtime Environment is also known as run-time system, runtime system, or runtime.

Runtime System

Runtime System is also known as run-time system, runtime environment, or runtime.

SEO Dictionary: List S

Scraper Site

Scraper Site is a form of content spam technique that copies all of its content from other websites using web scraping.

Script Language

Script Language is also known as Scripting Language

Scripting Language

Scripting Language is a programming language that supports the writing of scripts, programs written for a software environment that automate the execution of tasks which could alternatively be executed one-by-one by a human operator.

Search Box

Search Box refers to the box where you type your search query, or whatever it is that you're looking for.

Search Engine

Search Engine is a computer program that is designed to search for information on the World Wide Web.

Search Engine Indexer

Search Engine Indexer is a component of the search engine system that sorts and stores the contents of the full text of every Web document that it receives from the search engine's Web crawler.

Search Engine Indexing

Search Engine Indexing collects, parses, and stores data to facilitate fast and accurate information retrieval.

Search Engine Marketing

Search Engine Marketing (SEM) is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results page (SERP) through search engine optimization (SEO) (both on-page optimization and off-page optimization) as well as through advertising.

Search Engine Optimization

Search Engine Optimization is the process of improving the visibility of a website or a web page in a search engine's "natural" or un-paid ("organic" or "algorithmic") search results (SERP).

Search Engine Poisoning

Search Engine Poisoning is also known as spamdexing, search spam, search engine spam, or web spam.

Search Engine Results Page

Search Engine Results Page (SERP) is the listing of results returned by a search engine in response to a keyword query.

Search Engine Saturation

Search Engine Saturation refers to the number of pages that have been indexed in the search engine.

Search Engine Spam

Search Engine Spam is also known as spamdexing, search spam, web spam, or search engine poisoning.

Search Spam

Search Spam is also known as spamdexing, search engine spam, web spam, or search engine poisoning.


SEM is an acronym for Search Engine Marketing.

Semantic URL

Semantic URL is a form of URL that is immediately and intuitively meaningful to non-experts.

Semantic Web

Semantic Web is a common framework that converts unstructured and semi-structured documents on World Wide Web into structured and semantic data to be shared and reused across application, enterprise, and community boundaries.


Semantics is the branch of linguistics that deals with the systematic study of meaning.


SEO is an acronym for Search Engine Optimization.

SEO Process

SEO Process usually consists of six general phases, including research, planning and strategy, implementation, monitoring, (re)assessment, and maintenance.

SEO Risk

SEO Risk is a measure of the likelihood and loss of an unsatisfactory outcome affecting the SEO project, , or product.

SEO Risk Management

SEO Risk Management is the practice of assessing and controlling SEO risk that affects the SEO project, process, or product.

SEO University

SEO University is a leading search engine optimization university that offers SEO tutorials, courses, solutions, services, software, tools, books, and ebooks.

Separation of Concerns

Separation of Concerns (SoC) is a design principle that comprises the process of separating a computer program into distinct features that overlap in functionality as little as possible.


SERP is an acronym for Search Engine Results Page.


Server-Side refers to operations that are performed by the server in a client–server relationship in a computer network.

Signature Block

Signature Block is a block of text automatically appended at the bottom of an e-mail message, Usenet article, forum or blog post.

Simple Mail Transfer Protocol

Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks.

Simple Object Access Protocol

Simple Object Access Protocol (SOAP) is a protocol specification for exchanging structured information in the implementation of web services in computer networks.

Site Map

Site Map is a list of pages of a web site accessible to crawlers or users.


Sitelink is a hyperlink to website subpage that is shown below certain Google search results in order to help users navigate the site.


Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.

Six-Discipline Model

Six-Discipline Model is the model of the six disciplines inculding envision, plan, work, measure, improve, and discover, that are required to manage SEO or other projects sucessesfully. More information at .


Slug is a part of a URL which identifies a page using human-readable keywords.


Smartphone is a mobile phone built on a mobile operating system, with more advanced computing capability and connectivity than a feature phone.


SMO is an acronym for Social Media Optimization.


SMTP is an acronym for Simple Mail Transfer Protocol.


SOAP is an acronym for Simple Object Access Protocol.


SoC is an acronym for Separation of Concerns.

Social Bookmarking

Social Bookmarking is a centralized online service which enables Internet users to add, annotate, edit, organize, store, manage, search, and share bookmarks of resources online.

Social Media

Social Media refers to the means of interactions among people in which they create, share, exchange and comment contents among themselves in virtual communities and networks.

Social Media Marketing

Social Media Marketing is the process of gaining website traffic or attention through social media websites.

Social Media Optimization

Social Media Optimization (SMO) refers to the process of using a number of social media outlets and communities to generate publicity to increase the awareness of a product, brand or event. More information at .

Social Network

Social Network is a social structure made up of a set of actors (such as individuals or organizations) and the dyadic ties between these actors.

Social Networking Service

Social Networking Service is an online service, platform, or site that focuses on facilitating the building of social networks or social relations among people who, for example, share interests, activities, backgrounds, or real-life connections.

Social Relation

Social Relation refers to a relationship between two, three, or more individuals. It is derived from individual agency, and forms the basis of the social structure.

Social Science

Social Science refers to the academic disciplines concerned with society and human behavior.

Social Structure

Social Structure is a social science term to refers to patterned social arrangements in society that are both emergent from and determinant of the actions of the individuals.

Social Farm

Social Farm is unwanted spam content appearing on websites accepting user-generated content. This may include commercial spam, bulk submissions, user-submitted profanity, insults, threats, hate speech, leaked personally identifiable information, or malicious links.

Software Agent

Software Agent is a computer program that acts for a user or other program in a relationship of agency, which derives from the Latin agere (to do): an agreement to act on one's behalf.

Software Reuse

Software Reuse is also known as Code Reuse.


Spam is the use of electronic messaging systems to send unsolicited bulk messages, especially advertising, indiscriminately.


Spamdexing, also known as search spam, search engine spam, web spam, or search engine poisoning, is the deliberate manipulation of search engine indexes. Spamdexing techniques can be classified into two broad classes: content spam (or term spam) and link spam.


Spammer refers to the people who attempt to manipulate search engine results in violation of the search engine guidelines.


Specification is an explicit set of requirements to be satisfied by a material, product, or service.

Split Testing

Split Testing is also known as A/B Testing.

Statistical Model

Statistical Model is a formalization of relationships between variables in the form of mathematical equations.


Stemming refers to the process for reducing inflected (or sometimes derived) words to their stem, base, or root form.

Structural Metadata

Structural Metadata is a type of metadata that describes relationships within and among objects through elements such as links to other components.

Style Sheet Language

Style Sheet Language is a computer language that expresses the presentation of structured documents. Such as Cascading Style Sheets (CSS), which is used to style documents written in HTML, XHTML, SVG, XUL, and other markup languages.

Supplemental Index

Supplemental Index is a secondary index provided by search engine (such as Google) that is widely believed to contain content that it regards as less important. In a search engine, supplemental index is comprised of Web results (supplemental result) compiled with fewer restraints on sites than sites that are crawled for a main search engine index.

Supplemental Result

Supplemental Result is a URL residing in Google's supplemental index, a secondary database containing pages of less importance, as measured primarily by Google PageRank algorithm. More information at .


SWF is a vector graphics format owned by Adobe used to publish animations and interactive applications on the World Wide Web.

Sybil Attack

Sybil Attack is an attack wherein a reputation system is subverted by forging identities in peer-to-peer computer networks.

SEO Dictionary: List T

Targeted Advertising

Targeted Advertising is a type of advertising whereby advertisements are placed so as to reach consumers based on various traits such as demographics, psychographics, behavioral variables, firmographic variables and more.


TCP is an acronym for Transmission Control Protocol.

Term Spam

Term Spam is also known as content spam.

Term Weighting

Term Weighting refers to the importance of a particular search term to the query.

Thin Affiliate Site

Thin Affiliate Site is an affiliate site that doesn't add much value for users.

Title Tag

Title Tag is a string of text defines the title of the HTML or XHTML document. It tells both users and search engines what the topic of a particular page is.

Title Tag Optimization

Title Tag Optimization refers to the SEO process for title tag.


Trackback is one of three types of linkback methods for Web authors to request notification when somebody links to one of their documents.

Transmission Control Protocol

Transmission Control Protocol (TCP) is one of the core protocols of the Internet Protocol Suite.


TrustRank is a link analysis technique described in a paper by Stanford University and Yahoo! researchers for semi-automatically separating useful webpages from spam.


Twitter is an online social networking service and microblogging service that enables its users to send and read text-based messages of up to 140 characters, known as "tweets".


Typosquatting, also known as URL hijacking, is a form of cybersquatting, and possibly brandjacking which relies on mistakes such as typographical errors made by Internet users when inputting a website address into a Web browser.

SEO Dictionary: List U


UDP is an acronym for User Datagram Protocol.


UGC is an acronym for User-Generated Content.


UI is an acronym for User Interface.

Uniform Resource Identifier

Uniform Resource Identifier (URI) is a string of characters used to identify a name or a resource. Uniform resource identifier (URI) is either a uniform resource locator (URL), or a uniform resource name (URN), or both.

Uniform Resource Locator

Uniform Resource Locator (URL) is a uniform resource identifier (URI) that identifies a resource by locator.

Uniform Resource Name

Uniform Resource Name (URN) is a uniform resource identifier (URI) that identifies a resource by name, in a particular namespace.


Unix, officially trademarked as UNIX, is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, Michael Lesk, and Joe Ossanna.

Unnatural Link

Unnatural Link is a link that is built purely to increase the search engine rankings of a website.


URI is an acronym for Uniform Resource Identifier.


URL is an acronym for Uniform Resource Locator.

URL Forwarding

URL Forwarding is also known as URL Redirection.

URL Hijacking

URL Hijacking is also known as Typosquatting.

URL Redirection

URL Redirection, also known as URL forwarding, refers to the act of sending a visitor to a different URL than the one they initially requested.


URN is an acronym for Uniform Resource Name.


Usability is the ease of use and learnability of a human-made object, such as a website.

User Agent

User Agent is a software agent that is acting on behalf of a user.

User Agent Sniffing

User Agent Sniffing refers to the practice of Web sites showing different content when viewed with a certain user agent.

User Datagram Protocol

User Datagram Protocol (UDP) is one of the core members of the Internet Protocol Suite, the set of network protocols used for the Internet.

User-Generated Content

User-Generated Content (UGC) is a range of media content available in a range of modern communications technologies.

User Intent

User Intent is a text string exchanged between a Web browser or a web robot and a web server that identifies the source of the visit to the website.

User Interface

User Interface (UI), in the industrial design field of human–machine interaction, is the space where interaction between humans and machines occurs.

SEO Dictionary: List V

Value Proposition

Value Proposition is a promise of value to be delivered and a belief from the customer that value will be experienced. It can apply to an entire organization, or parts thereof, or customer accounts, or products or services.

Vertical Search Engine

Vertical Search Engine is a search engine focuses on a specific segment of online content, including images, videos, news, travel, and people.

Viral Marketing

Viral Marketing is the marketing techniques that use social networks and other technologies to produce increases in brand awareness or to achieve other marketing objectives through self-replicating viral processes.

Visible On-page Factors

Visible On-page Factors are the on-page factors that are visible to the vistors. More information at .

SEO Dictionary: List W


W3 is an acronym for World Wide Web.


W3C is an acronym for World Wide Web Consortium.


WAF is an acronym for web application framework.

Web Analytics

Web Analytics is the measurement, collection, analysis and reporting of internet data for purposes of understanding and optimizing web usage.

Web Application Framework

Web Application Framework (WAF) is a software framework that is designed to support the development of dynamic websites, web applications and web services.

Web Bot

Web Bot is also known as Web spider, Web robot, or bot.

Web Browser

Web Browser is a software application for retrieving, presenting and traversing information resources on the World Wide Web.

Web Browser Engine

Web Browser Engine, also known as layout engine or rendering engine, is a software component that takes marked up content and formatting information and displays the formatted content on the screen.

Web Cookie

Web Cookie is also known as cookie, HTTP cookie, or browser cookie.

Web Crawler

Web Crawler, also known as Web spider, Web bot, bot, or Web robot, is a computer program that browses the World Wide Web in a methodical, automated manner or in an orderly fashion.

Web Data Extraction

Web Data Extraction is also known as web scraping, or web harvesting.

Web Harvesting

Web Harvesting is also known as web scraping, or web data extraction.

Web Feed

Web Feed is a data format used for providing users with frequently updated content.

Web Hypertext Application Technology Working Group

Web Hypertext Application Technology Working Group (WHATWG) is a community of people interested in evolving HTML and related technologies.

Web Marketing

Web Marketing is also known as Internet marketing, online marketing, webvertising, or e-marketing.

Web Log

Web Log is also known as blog.

Web Ontology Language

Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies, which are characterised by formal semantics and RDF/XML-based serializations for the Semantic Web.

Web Ring

Web Ring is also known as Webring.

Web Robot

Web Robot is also known as Web spider, Web bot, or bot.

Web Scraping

Web Scraping, also known as web harvesting or web data extraction, is a computer software technique of extracting information from websites.

Web Spam

Web Spam is also known as spamdexing, search spam, search engine spam, or search engine poisoning.

Web Spider

Web Spider is also known as Web bot, bot, or Web robot.

Web Syndication

Web Syndication is a form of syndication in which website material is made available to multiple other websites. More information at .


WebKit is a layout engine software designed to allow web browsers to render web pages.


Webring, also known as Web ring, is a collection of websites linked together in a circular structure, and usually organized around a specific theme, often educational or social.

Website Traffic

Website Traffic is the amount of data sent and received by visitors to a website.


WHATWG is an acronym for Web Hypertext Application Technology Working Group.


Webvertising is also known as Internet marketing, online marketing, e-marketing, or web marketing.

White Hat

White Hat describes the use of techniques that follow the guidelines of a search engine.


Whitelist is a basic access control mechanism that allows nobody, except members of the white list.


WordPress is a free and open source blogging tool and a content management system (CMS) based on PHP and MySQL. More information at .

World Wide Web

World Wide Web (abbreviated as WWW or W3, commonly known as the Web), is a system of interlinked hyperlinks documents accessed via the Internet. With a Web browser, one can view web pages that may contain text, images, videos, and other multimedia, and navigate between them via hyperlinks.

World Wide Web Consortium

World Wide Web Consortium (W3C) is the main international standards organization for the World Wide Web.


WWW is an acronym for World Wide Web.

SEO Dictionary: List X


XHR is an acronym for XMLHttpRequest.


XHTML is an acronym for Extensible Hypertext Markup Language.


XML is an acronym for Extensible Markup Language.


XMLHttpRequest (XHR) is an API available in Web browser scripting languages such as JavaScript. It is used to send HTTP or HTTPS requests directly to a web server and load the server response data directly back into the script.


XMPP is an acronym for Extensible Messaging and Presence Protocol.

SEO Dictionary: List Y


Yandex is a Russian Internet company which operates the largest search engine (Yandex Search) in Russia with about 60% market share in that country.

Yandex Search

Yandex Search is a web search engine owned by Yandex.


Yahoo! Inc. is an American multinational internet corporation which provides its well-known web portal, search engine (Yahoo! Search) and other Internet-related products and services, including Yahoo! Directory, Yahoo! Mail, Yahoo! News, Yahoo! Finance, Yahoo! Groups, Yahoo! Answers, online advertising, online mapping, video sharing, fantasy sports and social media websites.

Yahoo! Search

Yahoo! Search is a web search engine owned by Yahoo!

Yahoo! Search Marketing

Yahoo! Search Marketing is a keyword-based pay per click online advertising service provided by Yahoo!.


YouTube is the largest video sharing community and platform, on which users can upload, view and share videos. YouTube uses Adobe Flash Video and HTML5 technology to display a wide variety of user-generated video content, including movie clips, TV clips, and music videos, as well as amateur content such as video blogging and short original videos.


YSlow is a service provided by Yahoo!, which can analyse web pages and suggest ways to improve their performance based on a set of rules for high performance web pages. More information at .

SEO Dictionary: List Z

Zend Engine

Zend Engine is an open source scripting language engine that interprets the PHP programming language.

Zend Framework

Zend Framework is an open source object-oriented web application framework (WAF) implemented in PHP programming language.

Zend Server

Zend Server is a PHP application server product line offered by Zend Technologies.

Zend Studio

Zend Studio is a commercial, proprietary integrated development environment (IDE) for PHP developed by Zend Technologies.

Zend Technologies

Zend Technologies Ltd. is an Israeli World Wide Web infrastructure software company, which offers PHP development products and solutions, including Zend Engine, Zend Framework, Zend Server, and Zend Studio.