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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.
 
 
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