Learn in the textbookSerial and Short-Range Wireless Interfaces
DefinitionNFC is a short-range wireless communication (近距離無線通信) standard in which devices talk by radio once they come within about 10 cm, and it is a type of RFID.
ExplanationCommunication starts as soon as a card or smartphone is held up (かざす) to a reader, and the short range makes an unintended connection unlikely. Besides reading and writing cards, it also lets two smartphones swap data.
AnalogyIt is like someone you can only hear once you are close enough to shake hands.
Memory hookShort for Near Field Communication: communicating in the "near field", right next to the device.