Vehicle Identification Number (vehicle identification number), called vehicle identification code in Chinese, is a set of characters assigned to cars by manufacturers for identification. The VIN code is a code consisting of 17 letters and numbers, also known as 17 identification code, frame number or 17 number. After arranging and combining the vehicle identification codes, the vehicles of the same model will not be repeated within 30 years, which is unique to vehicles, so it can be called "automobile identification card".