Describe the process that search site databases typically go through to update their information on a regular basis.

What will be an ideal response?

?Typically, this occurs using small, automated programs (often called spiders or web crawlers) that use the hyperlinks located on Web pages to crawl (jump continually) from page to page. At each Web page, the spider program records important data about the page into the search site's database, such as the page's URL, its title, the words that appear frequently on the page, and the keywords and descriptive information added to the page's code by the Web page author at the time the page was created. In addition to spider programs, search site databases also obtain information from Web page authors who submit Web page URLs and keywords associated with their Web sites to the search site, or who embed metatags (such as those that list keywords for the Web page or a description of the Web page for search sites) into their Web pages.