Search engines assist in locating information.
Some index only titles of WWW documents and others index significant words from the contents. Most search engines index the WWW, gopher sites, telnet and FTP directories as well as Usenet newsgroups. Single engine search engines perform topic or keyword searches on a URL, title, or the full text of a site. The third type of search engine, a meta-search engines, posts queries to multiple single search engines at one time and the results are combined. The following are basic descriptions of select search engines.