A HTML that contains information about a web page. Some search engines, such as Google, use software 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 users  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 URL address 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.

MP3 is the file extension for MPEG audio layer 3. Layer 3 is one of the 3 coding schemes (layer 1, layer 2, layer 3) for the compression of audio signals. MP3 files can be embedded into websites to provide music while visitors are viewing the site. MP3 files are quite small compared to other audio files and are therefore suitable for transferring over the internet.