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The '''deep web''' (or '''invisible web''' or '''hidden web''') is the name given to the publicly accessible pages on the [[World Wide Web]] that are not indexed by [[search engine]]s. It consists mainly of dynamically generated pages that are based on responses to [[database]] queries. It should not be confused with the term ''dark web'' or ''[[Dark internet]]'' which refers to machines or clusters of machines unreachable by other computers on the internet.
Search engines use [[web crawler]]s that follow [[hyperlink]]s. Such crawlers typically do not submit queries to databases due to the potential infinitude of queries that can be made to a single database.
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