An abstract class is a parent class that allows inheritance 
but can never be instantiated

Abstract classes are the classes with no implementation of 
methods or concerete implementation of methods

An Interface can inherit several interfaces.

Abstract class:
Abstract class act as base class, not instantiable, no 
implementaiotn in base class but allow implementaiotn in 
derived class with overide method, method must be abstract.
specially used in inheritance.

Interface:

Interface class dont have constructor, destructor, 
always public modifier set to true 
no implementation
cant used multiple inheritance instead of this we use 
multiple interface

We can not create object of abstract class.It is base class
which inherit by other class.we can give at least one
definition in the class.It support inheritance.