The most efficient search tools are Lycos, Excite, WebCrawler and Yahoo. Due to their size alone, you will find most of the information from these sites. Try a variety of search tools to fully explore your topic as different sites return different information.
Search Engines allow you to search databases for keywords or phrases via a forms-based page.
Directories contain lists of sites organized by topic.
Metasearch pages list multiple resources for launching queries