Near Field Communication (NFC) relies on near-field electromagnetic coupling to securely transmit information wirelessly between compatible devices. NFC is widely used in authentication with NFC hardware becoming part of most smartphones.
NFC emerged as a sub-class of RFID, now operating at 13.56 MHz, with additional security features. Owing to its non-radiative nature, NFC can be used safely in body-centric applications, at higher power levels and with lower losses than higher frequency RF data transmission approaches. NFC can also be used to provide power to battery-free RF "energy harvesting" low-power receivers such as embedded microcontrollers and sensors.