RFID (Radio Frequency Identification) technology, also known as radio frequency identification, is a communication technology commonly known as electronic tags. Radio signals can be used to identify specific targets and read and write relevant data without the need to identify mechanical or optical contact between the system and a particular target.
For radio frequency, it is usually microwave, 1-100GHz, suitable for short-distance identification communication.
RFID readers are also mobile and fixed. Currently, RFID technology is widely used, such as: libraries, access control systems, food safety traceability, etc.