Difference between Abstract Class and Sealed Class in C#

Abstract Class:-

• A Class which contains one or more abstract functions  is known as Abstract Class.
• An Abstract Class can contains Non - Abstract and Abstract functions.
• Creating a new class from an abstract class is compolsory to consume it.
• An Abstract Class can not be instantiated directly, we need to create a object for derived class to consume an Abstract class.
• Use Abstract Keyword to make a class as a Abstract.
• An Abstrac class  can not be the bottom most class with the Inheritance hierarchy.
• An Abstract Class should be used as a base class only.

Sealed Class:-

•  A Class from which is not possible to derive a new class is known as Sealed Class.
•  A Sealed Class can contains Non - Abstract  functions and can not contain Abstract and Virtual functions.
• It is not possible to create a new class from the sealed class.
• We should not create a an object for sealed class only to consume it.
• Use Sealed Keyword to make a class as a Sealed.
• Sealed class should not be the bottom, most class with in the Inheritance hierarchy.
• A Sealed class can not be used as  base class.