Tor is defined as a third-generation onion routing system that addresses limitations in the original design by adding forward secrecy, congestion control, directory servers, integrity checking, configurable exit policies, and a practical design for location-hidden services via rendezvous points. It is one of the pioneers in anonymous network communications solutions today and is also a way to bypass circumvention.
Tor allows people to access information safely and anonymously. The architecture relies on the computers of volunteers and sponsors since they share internet connections used by others. When users join the Tor network, they can contribute to the community by becoming a relay or a bridge in the system. These terms will be described in the following section.