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The number of potential page views a site has available for advertising.

Affiliate programs allow other people to sell your products on a commission basis. All your affiliates really do is place link to your site. When a visitor arrives at your site, your affiliate program "makes a note" of the site that referred him. If a visitor buys something and the referring site belongs to one of your affiliates, you pay that affiliate either a percentage of the sale or a fixed amount - according to your agreement.

Algorithms are sets of rules according to which search engines rank web pages. Figuring out the algorithms is a major part of SEO. The thinking is that if you understand how they calculate relevance, you can make specific pages on your site super relevant for specific search terms.

The practice of machine-based, automatic submission of URLs to search engines, usually with the use of submission software or submission services.

A link to a page that no longer exists or has been moved to a different URL. Search engine spiders regularly respider pages in its index and removes dead links. Most search engines also offer ways for users to report dead links.

Referring to the different ways different browsers display the same page. A key consideration in web design (and SEO) is to create pages that are browser independent - in other words pages that work as they are supposed to regardless of the user's choice of browser.

Search engines can track user clicks in order to "learn" from users which pages are most relevant to a query. The best-known example is that of "Direct Hit", a discontinued search engine that not only tracked clicks but also logged the amount of time users spent on pages returned in order to improve relevance.

Referring to links between a family of domains - for example your business site, your personal homepage and your cat's homepage. Cross linking is sometimes used to inflate link popularity. Although not yet proven (to my knowledge), excessive cross linking is widely believed to be penalized by the search engines.

Referring to the removal of pages from a search engine index. De-listing can occur at the request of the site owner or a variety of other reasons. Most often, de-listing occurs when a page breaks one of a search engine's submission rules, making itself guilty of some sort of spamdexing

Once a month Google updates its entire index of web sites. That is called the Google Dance and can last for a couple of days – usually it’s from about the 20th to the 28th of every month.