Tails is a live operating system, that you can start on almost any computer from a DVD or a USB stick. 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.
Tails comes with several built-in applications pre-configured with security in mind: web browser, instant messaging client, email client, office suite, image and sound editor, etc.
PS I’m using this software since the very beginning. It’s not fool-proofed and doesn’t makes you invisible or totally and all around secure. You should use it – but you should not trust!
Text taken from Tails website