Tor

The Tor network is a free and open-source overlay network that enables anonymous communication by routing users' internet traffic through a random path of volunteer-operated relays worldwide. Using Tor makes it difficult to trace a user's internet activity by concealing their location and usage from anyone performing network surveillance. Developed by the United States Naval Research Laboratory in the 1990s, Tor is used by various individuals and organizations for both licit and illicit purposes, including criminal enterprises, hacktivism groups, and law enforcement agencies.learn more on wikipedia