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Related to deep Web: Dark web
deep Web(1) Sometimes, the "dark" Web is erroneously used to mean the deep Web (definition #2 below). See dark Web.
(2) Content on the Web that is not found on a Google, Yahoo or Bing search because it has been coded to not be indexed by the search engines. Deep Web content is thousands of times larger than the public Web ("surface Web").
Also known as the "invisible Web," viewing such content is accomplished by going to the desired website and typing the query into a search box. Countless sites make their content available to the public via one or more search boxes, and registration may be required. Deep Web content is not stored within the Web pages; it typically resides within a database. However, search tools do exist that can query deep Web content. See LexiBot.
(3) Password-protected content on the Web available only to members and subscribers.
(4) See deep link.