About Tor
Tor (The Onion Router) is a free software implementation of second-generation onion routing – a system which claims to enable its users to communicate anonymously on the Internet. Tor aims to conceal its users' identity and their network activity from traffic analysis. Operators of the system operate an overlay network of onion routers which provides anonymity in network location as well as anonymous hidden services.
please see wikipedia.org and Torproject.org
