https://tails.net/about/index.en.html
To use Tails, shut down the computer and start on your Tails USB stick instead of starting on Windows, macOS, or Linux.
You can temporarily turn your own computer into a secure machine. You can also stay safe while using the computer of somebody else…
Tails always starts from the same clean state and everything you do disappears automatically when you shut down Tails…
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…
You can save some of your files and configuration in an encrypted Persistent Storage on the USB stick: your documents, your browser bookmarks, your emails, and even some additional software…
