http://dnbible7sqskwppgaqohboxz7u5kzffjzdx3lxzpjtt3s6tzeiytb5ad.onion/bible/operating-systems/tails/index.html
It aims at preserving your privacy and anonymity, and helps you to: use the Internet anonymously and circumvent censorship (because 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 and use state-of-the-art cryptographic tools to encrypt your files, emails and instant messaging As you can see it is a pretty useful operating system for doing things that you do not want others to find out.