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.