Near field communication (NFC) is a short-range wireless technology that allows data exchange between devices when touched together or brought within close proximity. NFC operates at 13.56 MHz and can communicate at speeds up to 424 kilobits per second within a 10 centimeter range. The document discusses NFC architecture, communication modes, operating modes, threats including eavesdropping and data modification, and defenses such as using encryption to establish a secure channel. It also provides applications of NFC like contactless payments and digital content sharing.