The Internet can be searched by using: 

Search Engines 
Also called "spiders" or "crawlers," search engines are software that constantly roam the Internet indexing Web sites. Search engines are running constantly and index millions of Web pages. They often find information not available in directories. 


Subject Directories 
A subject directory, or subject list, is a hierarchical subject tree which organizes Web documents. These are organized by humans. Sites are submitted and assigned to a subject category such as "Entertainment," " Health," "Science," "Sports," etc. Directories find fewer and often more relevant sites. Yahoo! is one of the oldest and best known subject directories.

Most recent revision: Sunday, March 6, 2005