Honestly speaking, the VIN check can tell you everything that was ever documented about the car.
The vehicle’s information: brand, model, the country and date of fabrication, engine power, body, fuel or transmission type etc.
The vehicle’s history: real mileage, if it was involved in accidents, if it was stolen, technical information about the technical checks or previous owners, the countries in which the vehicle was registered in etc.
Pictures of the car over the years.
Model information: the factory installed equipment, usual malfunctions of that particular model etc.
Some VIN decoders can even present unique features, like the assessment of the market prices of the vehicle.