可可触摸类和普通swift类有什么区别？

I have been learning Swift language for a while, I am stuck with the one of the basic question, i.e. what is the basic difference between the file templates of a Cocoa Touch Class and a normal Swift class? Can some one provide any basic difference along with example? I know they are different because they each have an option for creating a file.I have been learning Swift language for a while