Tor Browser Bundle for Mac is a package that installs and manages the Tor project software on your Mac. Tor allows you to hide your identity and prevent IP address-tracking back to your device. The Tor Browser Bundle for Mac comprises a number of files, but it's easy enough to install.
Tor uses a set of servers around the world, most maintained by individuals, that reroute your URL request through two, three, or more different servers in an attempt to make your path from your Mac to the destination URL difficult to track back. Each hop in the Tor network hides your IP address a bit more, and after three hops it is very difficult for the destination device to know where the connection originated from. This effectively hides your IP address. Of course, the problem is the more hops, the longer it takes for traffic to route between the end URL and your machine, so Tor is a slower way of accessing the Internet. The Tor Browser Bundle for Mac is from the Tor project and includes files saying how to set up and use Tor. There's a set of videos on the Tor project Web site to help you get everything working properly, regardless of the browser you ultimately use.
Tor has been around for a while and is a well-used method of hiding your identity and IP address. The Tor Browser Bundle for Mac makes installing Tor on your machine easier. While still a work in progress, the Tor Browser Bundle for Mac is worth installing and using if you value your privacy and want to hide your location from remote sites. While not as friendly as some all-in-one packages available that use Tor, the Tor Browser Bundle for Mac is more versatile.
Tor is free software and an open network that helps you defend against a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security known as traffic analysis. 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. Tor works with many of your existing applications, including web browsers, instant messaging clients, remote login, and other applications based on the TCP protocol. Hundreds of thousands of people around the world use Tor for a wide variety of reasons: journalists and bloggers, human rights workers, law enforcement officers, soldiers, corporations, citizens of repressive regimes, and just ordinary citizens. See the Who Uses Tor? page for examples of typical Tor users. See the overview page for a more detailed explanation of what Tor does, and why this diversity of users is important. Tor doesn't magically encrypt all of your Internet activities, though. You should understand what Tor does and does not do for you. Tor's security improves as its user base grows and as more people volunteer to run relays. (It isn't nearly as hard to set up as you might think, and can significantly enhance your own security.) If running a relay isn't for you, we need help with many other aspects of the project, and we need funds to continue making the Tor network faster and easier to use while maintaining good security.