https://www.stlsecurity.com/blog/2020/5/30/what-are-chippedtransponder-keys-and-why-are-they-used-1
“Chipped, or Transponder, keys are keys that have an RFID (Radio Frequency Identification) chip inside the head of the key. These types of keys have become an industry standard for vehicle manufacturers. This is because the RFID chip adds an extra layer of security to your vehicle’s ignition. When a key is inserted into the ignition of a car with an immobilizer system, the car verifies that the RFID chip is present in the key and is programmed to the car. The immobilizer system is what will stop the ignition from allowing the car to be started should a key not be recognized by the car.?”
