Rfid technology is a communication technology, which can identify a specific target and read and write related data through radio signals without establishing mechanical or optical contact between the identification system and the specific target.

RFID technology has many applications: library, access control system, food safety traceability and so on. For example, bus card, canteen meal card, bank card, hotel access card, second-generation ID card, etc.

The working mode is similar to barcode scanning, while RFID uses a special RFID reader and a special RFID tag that can be attached to the target, and uses frequency signals to transmit information from the RFID tag to the RFID reader. RFID technology can identify high-speed moving objects and multiple tags at the same time, which is quick and convenient to operate.