Car ID is an abbreviation for 'car identification' and refers to the unique identification of a car. Synonyms for Car ID include vehicle identification number, registration number, license plate number, chassis number or VIN, plate number, model number or make, and engine number. These IDs help in identifying vehicles for registration, insurance, and any legal proceedings. Vehicle identification numbers or VINs have 17 characters that are unique to each car. It provides information about the manufacturer, model, and the year of production. License plate numbers are unique to each car and are issued by the state's Department of Motor Vehicles, displaying it on the rear or both ends of the car.