What is abstraction?

The process of hiding essential details is known as abstraction.
Abstraction has 2 types, they are

1.      Data abstraction:

                        We know that there will be some kind of data and we can express
              Eg: vehicle engine no, chasis no

2.      Functional abstraction:

          We can feel the behavior of an action but we cannot express what exact process going inside the method.

Eg: Applying acceleration and breaks to the vehicle.