Inheritence

Inheritance is one of the most important concepts in OOP.
It refers to the concept of allowing one class to be based on one or more existing classes.
The new class inherits the instance variables and methods from its parent class, including ones that the parent class has inherited itself.
It can then add instance variables and methods, or even modify ones that have been inherited.
Classes are organized in a hierarchy. The class above is called a superclass and the classes below are its subclasses.

They are also called the parent class and child class or the base class and derived class.

The child class should inherit everything it can from its parent class and only add additional code for new instance variables and the methods that are not in the parent class or need to have different behavior.
Inheritance is a very powerful mechanism for reusing code and is an important feature of all object-oriented programming languages.