A whole system that forgets the session at shutdown.
Tor Browser protects your traffic. It does not protect the machine underneath, which is still your everyday system. Tails closes that gap.
A complete operating system that boots from a USB stick, routes everything through Tor, and forgets everything at shutdown. Nothing is written to the machine's own disk.
For casual use, Tor Browser on your normal system is fine. For anything where the machine remembering the session is a risk you care about, Tails is the tool. Boot, use, shut down.
