Google Wallet is an NFC payment system that allows you to make purchases with supported devices.

The idea behind Google Wallet is to allow you to pay for purchases using a supported device at participating businesses. Instead of pulling out a card or cash, you simply tap your device to a payment kiosk and the app automatically loads and allows you to pay through an app.

Using Google Wallet is easy, but the difficulty is finding a business that supports NFC payments so it's use is limited..