An anonymizer or an anonymous proxy is a tool that attempts to make activity on the Internet untraceable. It is a proxy server computer that acts as an intermediary and privacy shield between a client computer and the rest of the Internet. It accesses the Internet on the user's behalf, protecting personal information by hiding the client computer's identifying information.
Tails is a live operating system, that you can start on almost any computer from a DVD, USB stick, or SD card. 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.