If you think of the web like an iceberg, you have the surface web up top. It's the internet you see and use every day and consists of all the websites indexed by traditional search engines like Google. It's where you shop on Amazon and listen to music on Spotify.
What's submerged is the deep web — an anonymous online space only accessible with specific software. Then there's the dark web, which is the part of the deep web that hides your identity and location.
It's basically just "a series of encrypted networks that serve to anonymize peoples' use on the internet," said Matthew Swensen, a Special Agent for the Department of Homeland Security with an expertise in cyber crimes.
It's relatively easy for anyone to access this encrypted network. All it takes is downloading darknet software. Swensen said the most common dark web networks are Tor, I2P, and Freenet, but "Tor is, by far and away, the most popular."