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Search engines are handy
tools that help you find what you're looking for on the Web.
Each search engine uses
special software (called spiders or robots) to compile a database of
pages found on the Web. When you submit a search, the search engine
scans its own database to match your terms against terms in the pages
of its database.
So, each search engine
searches the part of the Web it has collected--not the whole Web--and
each search engine has a somewhat different database of web pages.
Some examples of popular
search engines are
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