The document discusses the deep web and dark web. It defines the deep web as parts of the world wide web that are not indexed by standard search engines and contains much more data than the surface web. The deep web is used by the military, scientists, journalists and others to securely store and access data anonymously. While it provides advantages like anonymity and access to banned sites, it also enables illegal activities on the dark web like drug sales, hacking, and other crimes if misused. Proper safety precautions are needed when accessing the deep web.