The Dark Web is part of the World Wide Web that is not accessible via standard search engines such as Google, Bing, or Yahoo. It is part of the Deep Web, which encompasses all parts of the web not indexed by standard search engines; however, the Dark Web is specifically known for requiring specific, secure tools to access it, such as the Tor (The Onion Router) network or I2P (Invisible Internet Project).
The Dark Web is often associated with illegal activities such as the trafficking of drugs, weapons, illegal services, and the buying and selling of sensitive corporate data.