The document discusses the dark web and its evolution. It defines the dark web as encrypted online content that is not indexed by conventional search engines and can only be accessed through anonymity networks like Tor and I2P. The dark web was created by the US government to help operatives remain untraceable. It distinguishes between the surface web, deep web, and dark web. Over time, the dark web evolved from static HTML pages that could be crawled to more dynamic content behind queries and anonymity protocols, becoming more hidden from conventional search engines. While legal content on the dark web can be accessed safely, attempting to access illegal services risks getting into legal trouble.