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If not, then does WinRT have its own Garbage Collector?
I ask this because I read this: “There’s no need to manage the lifetime of underlying object. Windows releases the object when you’re finished with the last of its class instances that you’ve activated.” from MSDN.
They don’t. WinRT doesn’t use a garbage collector. Memory is managed with reference counting, IUnknown::AddRef() and IUnknown::Release(). Just like COM. And no, it isn’t Windows that takes care of the counting, it is the language runtime support library. Javascript always used reference counting, C++ gets it from the C++/CX language extensions or by using smart pointer classes.