What is the main advantage of making a class abstract

Question

Why do we declare a class as abstract? I know it cannot be instantiated, but why give a special keyword for it. Even a 'normal' class will work just as well and can be easily subclassed. so what is the main advantage of making a class abstract?

Answer 1

In abstract class you can implement some method and can make some abstract all your client will have to implement it also. you can provide some common functionality , also you can have some inherited fields and some of the skeleton method here