Abstract Class :
- when we create abstract class then we can not create object of that abstract class.
- If we want to use abstract class then we only access with derived class .
- Just abstract write before the class name.
- when we create abstract class two condition occurs one is abstract method like :- abstract protected function name ( );
- abstract means incomplete method we declare but not implement (code).
- In derived class we have to implement of that abstract method.

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