RFID refers to radio frequency identification technology. This is similar to the bar codes but RFID includes electromagnetic coupling which is used to send the signals. The major parts of RFID involve an antenna, silicon chips, and a transceiver. These can be used anywhere and anytime. The active RFID tags need power backup but the passive tags do not need power.
Initially, the technology was developed to detect or trace the pets but now it has been using in multiple fields. You may search for the RFID chip timing Greensboro North Carolina on the Internet to get useful information on this regard.