Apple's digital wallet payment system introduced with the iPhone 6 in 2014. Apple's Passbook app, renamed "Wallet," was enhanced to support credit cards, and users can make payments by tapping their Apple Watch or iPhone (starting with iPhone 6) on Apple Pay terminals in retail outlets. The iPhone's home button/fingerprint scanner adds an extra level of security to the transaction. Near Field Communication (NFC) Apple Pay uses NFC to transmit wireless between device and terminal, and the iPhone 6 and Apple Watch were the first Apple products to include it. See Apple Wallet, NFC, iPhone 6, Apple Watch, smartphone wallet and mobile payments service.