When to use #import & when @class - iPhone

Question

I have already created a class named "Category"

In some online examples I have seen - they have implemented #import "Category.h"

In some examples - class in pre declared like @category before @interface new class

So I am confused => When to use #import & => When to use @class?

Answer 1

http://stackoverflow.com/questions/322597/objective-c-class-vs-import repeat question, check this out