Difference between Abstract class and interface. || what is abstract class || what is interface || Features of Abstract Classes and interfaces

Hi friends, in this article i will explain about the Difference between Abstract class and interface or what is abstract class or what is interface or Features of Abstract Classes and interfaces.
What is an Abstract class?
Abstract class is a class that cannot be instantiated, it exists extensively for inheritance and it must be inherited. There are scenarios in which it is useful to define classes that is not intended to instantiate; because such classes normally are used as base-classes in inheritance hierarchies, we call such classes abstract classes.