AdWords
- Google’s advertising service for displaying Ads of your website as paid inclusion. More details can be found at http://adwords.google.com/
Alt tag
- A tag that provides alternative text for visually impaired users. Search engines may pick this text instead of graphical images.
Anchor text
- Anchor text is the visible text in a hyperlink. Search engines may pick this up for ranking.
Backlink
- Any direct link from another web page to your website. Backlinks can sometimes be known as Incoming Links.
Blog spam (or comment spam)
- Automatic posting random comments, promoting commercial services, to blogs, guestbooks, or other publicly-accessible online discussion boards.
Cloaking
- Serving a specific page to search engines and a different page to human visitors.
Crawl
- When a search engine visits your website and extracts your content for search results.
External links
- A link that forwards to a website outside the home domain name (third party).
Filename
- A file name, including directory path:  http://www.domain.com/path/file.html
Internal links
- A link that forwards to a website inside the home domain name.
Javascript
- A script language created by Netscape, that can be embedded into the HTML of a web page to add functionality.
Link farm
- A set of web pages that have been built for the sole purpose of increasing the number of incoming links to a web site. This is done in order to increase link popularity and search engine rankings.
Meta-tag
- A special HTML tag that provides information about a Web page. Generally used for search engines to describe your website.
PageRank (PR)
- Google's method to determine a page's relevance and importance through the quality of sites linking to it.
Referrer / Referring page
- When a user visits your website by clicking a link from another website, the other website is called a referrer.
SEO
- An abbreviation for Search Engine Optimization. To optimize and promote your website in a technique that makes search engines rank your website higher in search results.
Spam
- Excessive manipulation to influence search engine rankings, often for pages which contain little or no relevant content. Can result in penalization of a website by search engines.