RFID ( Radio Frequency identification ) is a standard ,specifically a protocol, that defines how a network uses radio signals to communicate with a tag placed in or attached to an object , an animal, or person. The tag, called a transponder, consists of an antenna and a memory chip that contains the information to be transmitted via radio waves. Through an antenna, an RFID reader, also called a transceiver, reads the radio signals and transfers the information to a computer or computing device. RFID tags are passive or active. An active RFID tag contains a battery that runs the chip's circuitry or magnetic chips both broadcasts a signal to RFID reader.