iOS 6 brought two new apps to the iPhone 5: Apple's Maps app and Passbook. The latter is a little hard to understand at first but is slowly catching on, as people realize its utility. Passbook, as you likely know by now, is a way that vendors can make things like tickets, coupons, and loyalty cards available in a single place on your iPhone. It's a convenience for you for two reasons: 1) you have all of these items in one place on your phone, and 2) your app automatically produces the right pass depending on where you are and communicates with a terminal at a ticket booth or point of sale.