Dark web 

     The dark web is the part of World Wide Web whose content only exists on dark net & overlay network(network built on the top of another network). It is encrypted network that exists between TOR servers & their users.To access dark web one needs specific software,configuration or authorisation.Darknet websites are accessible through TOR( “The onion routing”) & I2P( Invisible Internet project) networks. TOR allows anonymous access to the internet and I2P allows anonymous hosting of websites.The dark net clients identities & location remain anonymous and not traceable due to multiple encryption.The transmitted information can be decrypted by a subsequent node in the scheme which leads to exit node. It is almost impossible to rebuild the node path & decrypt the information.Dark web is filled with illegal activities or content such as illegal porn(child porn, child abuse,etc), drug markets, weapon markets , weapon exchange for the terrorist, bitcoin scam , hitmans , illegal software’s and much more.