RFID generally refers to radio frequency identification technology (communication technology term).
RFID, also known as radio frequency identification, is a communication technology that can identify specific targets through radio signals and read and write related data without establishing mechanical or optical contact between the identification system and the specific target. Extended information
The basic working principle of RFID technology is not complicated:
After the tag enters the magnetic field, it receives the radio frequency signal from the reader, and uses the energy obtained from the induced current to send out the energy stored in the magnetic field. The product information in the chip (passive tag or passive tag), or the signal reader actively sent by the tag at a certain frequency, reads the information and decodes it, and then sends it to the central information system for relevant data processing.
Reference material: Baidu Encyclopedia-Radio Frequency Identification Technology