An HTMLtag that contains information about a Web page. Some search engines, such as AltaVista, use spiders that index Web pages based on meta tags. So, in theory, an HTML or Web page author can control how a site is indexed by search engines and how and when it will be called up during a user's search. Within the meta tag, a keyword tag defines the primary keywords of a Web page. The meta tag can also specify an HTTP or URLaddress for the page to jump to after a certain amount of time (this is known as client pull). So, a Web page author can control the amount of time a Web page is up on the screen, as well as where the browser will go next.