In OOP a class is a template definition of the Methods and variable s in a particular kind of object. Thus, an object is a specific instance of a class; it contains real values instead of variables.

• A class can have subclasses that can inherit all or some of the characteristics of the class. In relation to each subclass, the class becomes the superclass.
• Subclasses can also define their own methods and variables that are not part of their superclass.
• The structure of a class and its subclasses is called the class hierarchy