Vehicle registration plates or personalised number plates are metal or plastic plates attached to a motor vehicle for official identification purposes. The registration identifier is a numeric or alphanumeric code that uniquely identifies the vehicle within the issuing region’s database. Most governments require a registration plate to be attached to both the front and rear of a vehicle, although certain jurisdictions or vehicle types, such as motorcycles, require only one plate, which is usually attached to the rear of the vehicle. National databases relate this number to other information describing the vehicle, such as the make, model, color, year of manufacture, engine size, type of fuel used and mileage recorded during the vehicles annual (or bi-annual) road worthiness test, Vehicle identification .