The document discusses the deep/dark web and its history. It defines the deep web as content not indexed by standard search engines, comprising 96% of the digital universe. The surface web is the visible web accessed through sites like Google and Facebook. The dark web requires tools like TOR to access and aims to conceal users' identities and activities. It describes the deep web's early use for military communication and research and how sites like Silk Road later used bitcoin for anonymous transactions of illegal goods.