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What is RFID?
RFID generally refers to radio frequency identification technology (communication technology terminology).

RFID, also known as radio frequency identification, is a communication technology that 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.

The basic working principle of extended data RFID technology is not complicated:

After the tag enters the magnetic field, it receives the RF signal sent by the reader, and sends the product information (passive tag or passive tag) stored in the chip with the energy obtained by the induced current, or the tag actively sends a signal reader with a certain frequency to read and decode the information, and then sends it to the central information system for relevant data processing.

References:

Baidu encyclopedia-radio frequency identification technology