Tails is a live operating system that you can start on almost any computer from a USB stick or a DVD.
It aims at preserving your privacy and anonymity, and helps you to:
use the Internet anonymously and circumvent censorship; all connections to the Internet are forced to go through the Tor network; leave no trace on the computer you are using unless you ask it explicitly; use state-of-the-art cryptographic tools to encrypt your files, emails and instant messaging.
more info at https://tails.boum.org/about/index.en.html
