RFID technology is based on the reading and processing of radio signals received from special tags attached to objects. Such RFID tags, consisting of an antenna and a microchip, are called transponders. The antenna picks up the signal from the RFID reader, transmits it to the microchip, and converts the received electromagnetic waves into energy, which it uses to process the request and transmit a response.
Active RFID tags with a built-in energy source can be used to increase the reading range.
RFID is widely deployed in commerce, transport, airport baggage systems, and other fields.