Original: The class would list types of such attributes and also define the actions which a person can perform: "run", "jump", "sleep", "walk", etc.
Simplified: 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". Although there is only one class called "car", there could be many objects that are created from the class called "car".