NFC devices can be used as contactless smart cards, smart card reader terminals and device data transmission links. NFC applications can be divided into four basic types. For applications such as access control or flow/activity ticket checking, users only need to place the device with the ticket or access code close to the reader. It can also be used for simple data collection applications, such as reading URLs from smart tags on posters, contacting and confirming. For applications like mobile payments, users must enter a password to confirm the transaction, or only accept the transaction. Contact and contact. By connecting two NFC devices, point-to-point network data transmission can be realized, such as downloading music, exchanging images, or synchronizing address books. Contact and explore. NFC devices can provide multiple functions. Consumers can explore the functions of NFC devices and discover the potential functions and services of NFC devices.