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Explain the Polymorphism principle.

The meaning of Polymorphism is something like one name many forms. Polymorphism  enables one entity to be used as as general category for different types of actions. The specific action is determined by the exact nature of the situation. The concept of polymorphism can be explained as "one interface, multiple methods".

or in short

Polymorphism is the feature that allows one interface to be used more than one class. In other world we can say polymorphism is a reusability of object in more than one class.