Tails, also known as 'Amnesiac Incognito Live System', is a free security-focused Debian-based Linux distribution, which has a suite of applications that can be installed on a USB stick, an SD card or a DVD. It keeps users’ communications private by running all connectivity through Tor, the network that routes traffic through various layers of servers and encrypts data.
https://tails.boum.org/download/index.en.html