Can you explain IUnknown interface used in COM ?

Question

Amit Singh · Answer

COM is an acronym for Component Object Model. COM is a way of building objects that is independent of any programming language.
Every COM object implements an interface named IUnknown. It contains three methods:
-         QueryInterface: Returns a pointer to another interface
-         AddRef: Increments the objects reference count
-         Release: Decrements the objects reference count.

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Can you explain IUnknown interface used in COM ?

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