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121. Spider trap

An infinite loop that a spider may get caught in if it explores a dynamic site where the URLs of pages keep changing. For example, a home page may have a different URL and the search engine may not be able to ascertain that it is the home page that it has already indexed but under another URL. If search engines were to completely index dynamic web sites, they would inevitably have large amounts of redundant content and download millions of pages.

122. Sponsored links

Paid advertising which displays next to the natural search results. Customers can click on the ad to visit the advertiser's website. This is how the search engines make their money. Advertisers set their ads up to display whenever someone searches for a word which is related to their product or service. These ads look similar to the natural search results, but are normally labeled 'Sponsored Links', and normally take up a smaller portion of the window. These ads work on a Pay-Per-Click (PPC) basis (i.e. the advertiser only pays when someone clicks on their ad).

123. Static

As in "static web page." Means that the web page was not created dynamically from a database, but instead was previously created and saved as a HTML file.

124. Static IP Address

An IP address that is permanently assigned to a computer. The IP address doesn't change with each connection to the Internet. See also “Dynamic IP Address.”

125. Stemming

Word variations. For example, if I entered the query "swim", a search engine that supports stemming might return results that include "swimming" or "swims." Certain characters, such as ampersand (&), equals sign (=), and question mark (?), when in a web page's URL, tip off a search engine that the page in question is dynamic. Search engines are cautious of indexing dynamic pages for fear of spider traps, thus pages that contain stop characters in their URL run the risk of not getting indexed and becoming part of the "Invisible Web." Google won't crawl more than one dynamic level deep. So dynamic pages with stop characters in its URL should get indexed if a static page links to it. Eliminating stop characters from all URLs on your site will go a long way in ensuring that your entire site gets indexed by Google.

126. Stop word

A word which is ignored in a query because the word is so commonly used that it makes no contribution to relevancy. Examples are common net words such as “computer” and “web,” and general words like “get,” “I,” “me,” “the,” and “you.” Certain words, such as "the," "a", "an," "of," and "with," are so common and meaningless that a search engine won't bother including them in their index, or database, of web page content. So in effect, the stop words on your web pages are ignored as if those words weren't on your pages in the first place. Including a lot of stop words in your title tag waters down the title tag's keyword density.

127. Streaming media

Audio-visual content that is played as it is being downloaded. Thus, an Internet user could begin watching a video clip as the footage downloads rather than having to wait for the clip to download in its entirety beforehand.

128. Sub-directory

Directory or folder located in another directory or folder.

129. Sub-domain

130. Supplemental pages

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