What is the Tor Browser Bundle (TBB)?
The Tor software protects
you by bouncing your communications around a distributed network of
relays run by volunteers all around the world: it prevents somebody
watching your Internet connection from learning what sites you visit,
it prevents the sites you visit from learning your physical location,
and it lets you access sites which are blocked.
The Tor Browser Bundle lets you use Tor on
Windows, Mac OS X, or Linux without needing to install any software.
It can run off a USB flash drive, comes with a pre-configured web
browser to protect your anonymity, and is self-contained.