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Abstract: It is a class that can not be instantiated.

Interface: it's a completely abstract class.

Polymorphism: It means "many or multiple forms”.

Overload: It is applied to the methods and constructors.

Dynamic Link: It is what allows invoke operations on objects.

Public: a declared public member is accessible anywhere in the program.

Private: declared a private member can only be accessed by members of their own class.

Protected: declared protected member behaves exactly like a private one.