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Deep Web (Invisible Web)

The deep Web (also called Deepnet, the invisible Web, or the hidden Web) refers to World Wide Web content that is not part of the surface Web, which is indexed by search engines. It is estimated that the deep Web is several orders of magnitude larger than the surface Web.

These types of pages used to be invisible but can now be found in most search engine results:

  • Pages in non-HTML formats (pdf, Word, Excel, PowerPoint), now converted into HTML.
  • Script-based pages, whose URLs contain a ? or other script coding.


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