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SEARCH ENGINES
Search engines compile their databases by employing "spiders" or "robots" ("bots") to crawl through web space from link to link, identifying and perusing pages. Spiders regularly return to the web pages they index to look for changes. When changes occur, the index is updated to reflect the new information.

FINDSPOT a collection best search tools •••• Search Engine Showdown •••• Search Engine's Quick Guide •••• Start Your Engines •••• Search Engine Watch

Google

SEARCH COLLOSSUS - links to search engines from 232 countries around the world!

Individual search engines
http://www.altavista.com/
http://www.alltheweb.com/
http://www.google.com/
http://hotbot.lycos.com/
http://www.northernlight.com/

Meta-search engines
They search the databases of multiple sets of individual search engines simultaneously, from a single site and using the same interface. The searches they return are drawn from the top of search engine lists, and therefore tend to be more relevant.

Five meta-search engines
http://www.dogpile.com/
http://www.mamma.com/
http://www.profusion.com/
http://www.go2net.com/search.html

Subject directories
Subject directories are created and maintained by human editors, not electronic spiders or robots. Editors review and select sites for inclusion in their directories on the basis of previously determined selection criteria.There are general directories, academic directories, commercial directories, and portals. These portal sites not only link to the popular subject categories, they also offer additional services such as email, current news, stock quotes, travel information and maps.

Six subject directories:
http://www.excite.com/
http://www.yahoo.com/

Library gateways and specialized databases
Collections of reviewed and recommended links that have been created by subject specialists, usually librarians, to support research needs and to pinpoint high quality sites on the web.specialized databases on the web created by professors, researchers, experts, governmental agencies, business interests, or other subject specialists and individuals who have a deep interest in a particular field and have accumulated and compiled web links to it. Much of the information in these databases is unavailable to search engine spiders crawling the web.

Library gateways
Academic Information - http://www.academicinfo.net/
Argus Clearinghouse - http://www.clearinghouse.net/
Internet Public Library - http://www.ipl.org/ref/
Librarians' Index to the Internet - http://lii.org/
Living Web Library - http://www.livingweb.com/
PINAKES - http://www.hw.ac.uk/libWWW/irn/pinakes/pinakes.html

SPECIALTY SEARCH ENGINES
Beaucoup - http://www.beaucoup.com/
Search.com - http://www.search.com/
SearchEdu - http://www.searchedu.com/

EXAMPLES OF SPECIALIZED DATABASES AND COLLECTIONS
 Internet Movie Database - http://us.imdb.com/
Jumbo Software - http://www.jumbo.com/
Monster Board: Jobs- http://www.monster.com/
News Directory - http://www.newsdirectory.com/

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