(1) A Web page that contains a list of links to other Web sites. The order of the list is based on the number of clicks users make to each site. The more clicks, the higher up the list the link to the site moves. Webmasters use topsites as a way of attracting visitors and collecting per-click revenue. Typically written in PHP, although other languages are used, there are free topsite scripts available as well as commercial products. Monster Top List (www.monstertoplist.com) is a commercial vendor, while Dev Shed's Scripts (www.scripts.com) catalogs both free and paid topsite scripts by language.

(2) The starting point in an underground network. It is the root site from which copyrighted files are distributed illegally. See darknet.