Different Between Window and View

Hi Everybody,
I am really new from Xamarin.Mac platform,

I have a little question,

What is different between "View" and" Window"? or "ViewController" and "WindowController"?

I know that on ios , it usually only have one window and lots of view,

However , in mac osx , when i want to write a app, i dont know how should i choose , since when i put a view or window on storyboard, and display it,

they all display like a window,

Thanks,

Regards,