NFC (Near Field Communication) technology is a short-range wireless communication technology that enables mobile phones or other mobile devices to exchange data within a few centimeters. NFC technology can be used to implement various applications, such as payment, identity verification, access control, data exchange, etc.
The working principle of NFC technology is to use the principle of electromagnetic induction. When two NFC devices are in close proximity, the electromagnetic fields between them interact, allowing them to exchange data. The transmission distance of this technology is very short, generally within a few centimeters, so NFC technology is also called Near Field Communication (Near Field Communication).
NFC technology can be used to implement a variety of applications, including payment, identity verification, access control, data exchange, and more. For example, NFC technology can be used to pay in shops, banks, subway stations, etc., and it can also be used to verify identities, such as when going through airport security checks. In addition, NFC technology can also be used to exchange data, such as transferring files between mobile phones and printers.