Google and Yahoo attempt to find and index as many sites as possible. Search features vary greatly, as does the actual scope, size, and accuracy of the databases.

Both search engines include millions of pages in their databases, but none of them come close to indexing the entire Web, much less the entire Internet. Here is a list of some of what is missing:

• The content in sites requiring a log in
• CGI output such as data requested by a form
• Intranets; pages not linked from anywhere else
• Commercial resources with domain limitations
• Sites that use a robots.txt file to keep files and/or directories off limits
• Non-Web resources

SearchTimePro is the users' guide to Web searching, compares and evaluates Google and Yahoo from the searcher's perspective.

Google Review | Yahoo Review

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