Oops concepts 1) what is polymorphism 2)what is function overloading,overriding 3)what is virtual function 4) what is friend function

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Explanation of polymorphism, function overloading/overriding, virtual function, and friend function.

Polymorphism is the ability of an object to take on many forms.
Function overloading is having multiple functions with the same name but different parameters.
Function overriding is having a derived class provide its own implementation of a method that is already provided by its parent class.
Virtual functions are functions that can be overridden in derived classes.
Friend functions are functions that are not members of a class but have access to its private and protected members.

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