VIN numbers are a unique coded set of characters that contains information and details for various types of vehicles. The information you can get from the vehicle's VIN is the type of transmission and engine it has, where it was made, and some other information. If you have any plans to buy a vehicle whether it is brand new or used you can use the VIN decoder to get detailed information about the vehicle and also check its current condition.
If you need the VIN of your own car, then the easiest way to look it up is in the documents. But when buying a used car, it's best to make sure with VIN decoder that the documents provided by the seller refer specifically to this car, for which you need to check the VIN with the documents from the VIN for the car.