Tails is a portable operating system that protects against surveillance and censorship.

Avoid surveillance, censorship, advertising, and viruses
Tails uses the Tor network to protect your privacy online and help you avoid censorship. Enjoy the Internet like it should be.

Your secure computer anywhere
Shut down the computer and start on your Tails USB stick instead of starting on Windows, macOS, or Linux. Tails leaves no trace on the computer when shut down.

Digital security toolbox
Tails includes a selection of applications to work on sensitive documents and communicate securely. Everything in Tails is ready-to-use and has safe defaults.
You don't have to worry about the computer having viruses because Tails runs independently from the other operating system and never uses the hard disk. But, Tails cannot always protect you if you install it from a computer with viruses or if you use it on a computer with malicious hardware, like keyloggers.
Tails always starts from the same clean state and everything you do disappears automatically when you shut down Tails.

Without Tails, almost everything you do can leave traces on the computer:
- Websites that you visited, even in private mode
- Files that you opened, even if you deleted them-
- Passwords, even if you use a password manager
- All the devices and Wi-Fi networks that you used

On the contrary, Tails never writes anything to the hard disk and only runs from the memory of the computer. The memory is entirely deleted when you shutdown Tails, erasing all possible traces.