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| Search Engines: Do not search the entire internet and are biased to search sites that receive the most traffic. |
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| MetaSearch Engines: Search the Search Engines (eg, a keyword at Mamma.com will return sorted results from Yahoo!, Ask Jeeves, NBCi, FindWhat, Lycos, GoTo.com, LookSmart and more with a single stroke.) |
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| Net Directories: Collection of links to websites and pages, organized into categories and sub-categories. Usually, each item is annotated with a short description; often written by a human rather than extracted automatically. |
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Scholarly Internet Resource Collections
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Only highest quality sites. |
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| Invisible Web (i.e. Deepnet, Deep Web, Hidden Web): World Wide Web content that is not searchable by standard search engines. |
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