A subject directory, or subject list, is a hierarchical subject tree which organizes Web documents. These are organized by humans. Web sites are assigned to a subject category such as "Entertainment," "Health," " Science," etc. Directories find fewer and often more relevant sites. 

Popular Subject Directories: 

Yahoo! - dir.yahoo.com 
One of the first subject directories Yahoo! consists of over 2 million submitted Web pages.  
Librarians' Index to the Internet - www.lii.org 
Developed by librarians for public library users with over 13,000 sites.  
INFOMINE  - infomine.ucr.edu 
About 100,000 scholarly Internet sites from the librarians at the University of California.
Google - www.google.com/dirhp 
"The web organized by topic into categories" includes about 1.5 million sites.

For a more detailed explanation of different Search Engines and Directories with search tips visit the: 
InfoPeople Search Tools Chart 

Most recent revision:Tuesday, November 22, 2005