This document defines terms commonly used in search engine optimization (SEO). It provides definitions for over 20 SEO-related terms, including backlink, cache, dead link, external link, Facebook, Google Analytics, hidden text, inbound link, JavaScript, keyword, link spam, metadata, nofollow, organic search result, PageRank, QR algorithm, rich snippets, search engine optimization, title tag, URL redirection, viral marketing, white hat, XML, YouTube, and Zend Engine.

1. SEO GLOSSARY

2. A/B Test
A/B Test is the practice of creating two
software programs, documents or
websites that are nearly the same for
the purpose of determining which
design or copy variation produces the
better result. Often used in PPC
marketing, (such as Google AdSense
and Bing Ads), occasionally used in
organic SEO.

3. Backlink
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.

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

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

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

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

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

9. 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.

10. Inbound Link/Incoming Link
Inbound Link is also known as backlink,
incoming link, inlink, or inward link.

11. JavaScript
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.

12. Keyword
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.

13. 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.

14. Metadata
Metadata 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.

15. Nofollow
by adding rel=“nofollow” to a hyperlink, a
page signals that the hyperlink’s
destination should not be ranked by search
engines.

16. 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.

17. PageRank
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. See Google PageRank for more
information.

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

19. 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.

20. 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).

21. Title Tag
Title Tag is a string of text defines the title
of the document, it is required in all HTML
documents. Title tag is visible in both a title
bar of browser window and a search engine
results page (SERP), as well as it is also in
the page when it is added to favorites.

22. URL Redirection
URL Redirection, also known as URL
forwarding, is a World Wide Web technique
for making a web page available under
more than one URL address.

23. 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.

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

25. XML
XML is an acronym for Extensible Markup
Language.

26. YouTube
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.

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