Passbook (application)
The Passbook application shows the following kinds of 2D barcodes: Aztec, PDF417, and QR. Each digital coupon or ticket is called a "pass". When the user starts Passbook for the first time, a short introduction screen will appear with a button inviting users to find applications on the App Store that integrate Passbook. Passes can also be distributed with the internet via Safari or sent to another user using e-mail.