So what is RFID, exactly? I could tell you that “RFID” stands for “Radio-Frequency Identification”, but that doesn’t clear things up much. Basically, RFID is the technology that makes your touch-and-go credit cards work. RFID sends out a little data signal that can be read at a short distance by RFID readers. Do you have a public transportation card that you touch to a turnstile to gain access to a bus or subway? There’s probably an RFID chip in that card. Does your apartment complex have a card lock gate? RFID.