Why It is not allowed to inherit sealed class

Question

Hi all!

.Net framework doesn't allow us to inherit a Sealed class.

I want to know how it restricts us to inherit a sealed class? I mean what is the difference between normal class and a sealed class because of which, we can't inherit sealed class?

e.g. I am ensuring that I am not going to inherit a class in my application and I am also assured that, nobody will use this class as a base class. Then is it makes any difference if I declare it as a sealed class?