A click on a link that leads to another website.

Using scripts to track clicks into and out from a website. Also can be used to shield a link from being picked up as a back link to another site.

A method of delivery that changes which page is displayed depending on the user asking for the page. This process is used by unscrupulous webmasters to deliver highly optimized pages to search engines while end users see a different page. Such practice is considered spam by many search engines.

In search engine results page, clustering is limiting a website to appear once or twice in the results.

An HTML tag that is invisible to end-users, but can be picked up by search engines.

Program that tracks the number of impressions to a web page.

Cost per Action. Paid when a certain action is performed by a user.

Cost per Click. Paid when a link is clicked upon.

Cost per Mil (1000). Amount paid for every 1000 views of an advertisement.

This is the process by which a search engine indexes web pages into its database. Please refer to spider for more information.

This is the process by which a search engine indexes web pages into its database. Please refer to spider for more information.

Multiple sites all linking to each other.

Cascading Style Sheet. Used to easily manipulate and effect the design of a web page.