• Polymorphism is a special mechanism that can be used with inheritance concept.
   
• Meaning that relation of "is type of " parent and child classes must be created first before applying this mechanism.  Without inheritance, you CANNOT apply the polymorphism.
   
• In a short definition, "POLYMORPHISM" means "having many different forms."
  -- By implementing polymorphism, an object reference of parent class can be used as a   reference to point to the objects of child classes.  The object reference has already become polymorphic because it has already been provided with many forms of objects to be referred or pointed.

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