Tor is a network of virtual tunnels that allows you to improve your privacy and security on the Internet. Tor works by sending your traffic through three random servers (also known as relays) in the Tor network, before the traffic is sent out onto the public Internet
The image above illustrates a user browsing to different websites over Tor. The green monitors represent relays in the Tor network, while the three keys represent the layers of encryption between the user and each relay.
Tor will anonymize the origin of your traffic, and it will encrypt everything between you and the Tor network. Tor will also encrypt your traffic inside the Tor network, but it cannot encrypt your traffic between the Tor network and its final destination.
If you are communicating sensitive information, for example when logging on to a website with a username and password, make sure that you are using HTTPS (e.g. https://torproject.org/, not http://torproject.org/).