Abstract

Once you define the name but not implement the body and all child classes should implement their own bodies under defined name it's called abstract.

if you set a method as abstract in a class, you have to define class itself as abstract

if all the members are abstract class can be defined as interface

public abstract class Shape
{
  public abstract void Draw();
}

Draw method cannot have a method body,

Derived class must implement all abstract members in the base abstract class

Abstract classes cannot be instantiated

When you want to provide some common behaviour, while forcing other developers to follow your design

Virtual can be overridden but not a must and it can have a body. Abstract must be overridden in derived classes and cannot have a body.

in Abstract classes there can be implementations

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