http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/print.html
A short introduction to Tor Basic functionality Tor is a distributed overlay network designed to anonymize
low-latency TCP-based applications
such as web browsing, secure shell, and instant messaging.
The network is built of a number of servers, called relays (also called “onion routers” or “ORs” in some older documentation).