RFID stands for Radio Frequency Identification, it uses radio waves to automatically identify people or objects.
An RFID system consists of a tag, which is made up of a microchip with an antenna, and an interrogator or reader with an antenna. The reader sends out electromagnetic waves. The tag antenna is tuned to receive these waves. A passive RFID tag draws power from the field created by the reader and uses it to power the microchip’s circuits. The chip then modulates the waves that the tag sends back to the reader and the reader converts the new waves into digital data.
RFID has been used primarily to track and protect assets. It is widely used by retailers and expected to revolutions logistics. There are also access control applications for RFID where a user carries a tag that unlocks the door to a room or location when the person approaches the reader.