| A web search engine is a software system that is designed to search for information on the world wide web. Many search engines use a form of boolean logic and truncation in the search. The functionality and results vary between search engines. |
Crawler |
| A web crawler or spider is a computer program that automatically retrieves websites for use by search engines. Examples of search engines that use this software include: |
 Bing |
 Google |
 Yahoo |
Meta search engines |
| A meta search engine uses software designed to optimise retrieval by querying multiple web search engines and combining the results. Examples include: |
 Zoo |
 Infospace |
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