Answer Posted / prem

Abstract Class

An abstract class is a special kind of class that cannot be
instantiated. So the question is why we need a class that
cannot be instantiated? An abstract class is only to be
sub-classed (inherited from). In other words, it only allows
other classes to inherit from it but cannot be instantiated.
The advantage is that it enforces certain hierarchies for
all the subclasses. In simple words, it is a kind of
contract that forces all the subclasses to carry on the same
hierarchies or standards.

Interface.............

An interface is not a class. It is an entity that is defined
by the word Interface. An interface has no implementation;
it only has the signature or in other words, just the
definition of the methods without the body. As one of the
similarities to Abstract class, it is a contract that is
used to define hierarchies for all subclasses or it defines
specific set of methods and their arguments. The main
difference between them is that a class can implement more
than one interface but can only inherit from one abstract
class. Since C# doesn�t support multiple inheritance,
interfaces are used to implement multiple inheritance.

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