1.Abstraction : Hiding Unnecessary part of data in the program is called abstraction.
2.Inheritance: It is the process of deriving a new class from old one. The old class is known as super class and the new one is sub class
3.Polymorphism: Ability to take more than one form is called polymorphism. Method overloading and overriding are the examples of polymorphism.
4.Encapsulation: Wrapping up of methods and variables into a single unit is called encapsulation.
