I spent several hours today reviewing this tool. No gimmicks, it's non-profit, originally developed as part of a US Navy initiative to secure communications. I've installed it, will use more and more for my regular browsing. With Obama insanity continuing via DHS, ANYONE who did not vote for Obama, thinks the government is 'bad', or <fill in blank>... is up for 'detainment'.
Never imagined this could happen so fast in the US.
Tor 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, and it prevents the sites you visit from learning your physical location.