An example of the Dark Web is Silk Road, a website for the buying and selling of recreational drugs.
dark Web - Computer Definition
(2) The collection of software and servers used to distribute music, videos and other copyrighted material illegally. Before the Internet became popular, the dark Web was small and distribution was by floppy disk or tape. Today, the Internet enables copies of copyrighted material to be sent to millions of people around the world within days.