The DEEPWEB, invisible web,or hidden web are parts of the World Wide Web whose contents are not indexed by standard search engines for any reason. The deep web is opposite to the surface web.
The deep web includes many very common uses such as web mail, online banking but also paid for services with a paywall such as video on demand, and many more.
Computer scientist Mike Bergman is credited with coining the term deep web in 2000 as a search indexing term.