Radio frequency identification (RFID) describes a system that transmits the identity (in the form of a unique serial number) of an object or person wirelessly, using radio waves. It's grouped under automatic identification technologies.
A typical RFID tag consists of a microchip attached to a radio antenna mounted on a substrate. Antennas read passive tags on cases stacked on a pallet and the information can be retrieved from the tags by RFID readers which pass the information in digital form to a computer system