What is polymorphism? Difference between union and structure

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Polymorphism is the ability of an object to take on many forms.

Polymorphism allows objects of different classes to be treated as if they are of the same class.
It is achieved through method overloading and method overriding.
Example: A parent class Animal can have child classes like Dog, Cat, and Bird. Each child class can have its own implementation of the method 'makeSound', but they can all be called using the same method name.
A structure is a collection of variables of different data types while a union is a collection of variables of the same data type that share the same memory space.
In a structure, all variables are allocated separate memory space while in a union, only one variable can be accessed at a time.

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