how are static class instantiated

Question

I want to know how are static class Instantiated. I mean according to OOPS concepts no class can be used without instantiating it. But still we can use static classes without instantiating it, so when and how does static classes get instantiated.

Edited-------

Also I am confuse about the constructor calls when I am inheriting an abstract class and I make a instance of child class. can anyone explain me that also.

Thanks in Advance.