The Deep Web forms the majority of the information currently stored and accessed using the World Wide Web (the Deep Web constitutes approximately 90% of the World Wide Web). If a website requires a username/password to access specific information on the site, that information can be considered to be part of the Deep Web. Moreover, unlike the Surface Web, the Deep Web is not indexed and referenced by search engines. It is important to note that the majority of information in the Deep Web is mundane and perfectly legal, contrary to many media reports (which often use the term Deep Web interchangeably with Dark Web, each of which are actually different).
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