RFID stands for Radio-Frequency Identification. RFID is the use of radio waves to reach and capture data. The RFID chip can hold about 2,000 bytes of info.
The RFID device serves the same purpose as a bar code or a magnetic strip on the back of a credit card or ATM card; it provides a unique identifier for that object. And, just as a bar code or magnetic strip must be scanned to get the information, the RFID device must be scanned to retrieve the identifying information.