HTML Views may show different kinds of files. However, probably the most used file type in the HTML view is the HTML page. The HTML page is the kind of page used on the Internet to show information. As the Internet is gaining popularity, so is a direct use of the Internet from within Service Desk. For example, you may contact a supplier directly through their web page to order new printers.
To find more information on how to browse the Internet, refer to the help of Internet Explorer.