In this example, there are three classes: 1) a class called "car", 2) a class called "pick-up truck", and 3) a class called "vehicle". These classes would be used to make objects. Although there is only one class called "car", there could be many objects that are created from the class called "car". And, although there is only one class that is called "truck", many objects of type truck could be created from this class. The "vehicle" class is actually general and there would probably not be any objects that were only of the class "vehicle". But a car would be a kind of vehicle and a truck would also be a kind of vehicle. So, you could say that both cars and trucks are from the same class, vehicle.