Radio Frequency Identification (RFID) is an automatic
identification method, relying on storing and remotely
retrieving data using devices called RFID tags or
transponders. An RFID tag is a small object that can be
attached to or incorporated into a product, animal, or
person. RFID tags contain silicon chips and antennas to
enable them to receive and respond to radio-frequency
queries from an RFID transceiver. Passive tags require no
internal power source, whereas active tags require a power
source.