📝 What is an Abstract Class?

The abstract modifier indicates that the thing being modified has a missing or incomplete implementation. The abstract modifier can be used with classes, methods, properties, indexers, and events.

An Abstract class is a class which is denoted by abstract keyword and can be used only as a Base class.

Abstract classes have the following features:

🔸 An abstract class cannot be instantiated.

🔸 An abstract class may contain abstract methods and accessors.

🔸 It is not possible to modify an abstract class with the sealed modifier because the two modifiers have opposite meanings. The sealed modifier prevents a class from being inherited and the abstract modifier requires a class to be inherited.

🔸 A non-abstract class derived from an abstract class must include actual implementations of all inherited abstract methods and accessors.

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