What is Darknet?
A darknet (or dark net) is an overlay network that can only be accessed with specific software, configurations, or authorization, often using non-standard communications protocols andports. Two typical darknet types are friend-to-friend networks (usually used for file sharing with a peer-to-peer connection) and anonymity networks such as Tor via an anonymized series of connections (from wikipedia)
What is Tor?
Tor is free software and an open network that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security (from https://www.torproject.org).
So how do I browse anonymously ?
Download Tor Browser from here and start browsing anonymously. Notice that upon each page refresh at Tor Browser (Visually is looks like FireFox) the regular Internet network will Identify you with different IP Address.