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The deep web, [1] invisible web, [2] or hidden web [3] are parts of the World Wide Web whose contents are not indexed by standard web search-engine programs. [4] This is in contrast to the " surface web ", which is accessible to anyone using the Internet. [ 5 ]
DeepPeep was a search engine that aimed to crawl and index every database on the public Web. [1] [2] Unlike traditional search engines, which crawl existing webpages and their hyperlinks, DeepPeep aimed to allow access to the so-called Deep web, World Wide Web content only available via for instance typed queries into databases. [3]