Any thing that exist in more than one form is known as the polymorphism.

Example of ploymorphism.
1. Abstract class(Because, In the abstract super class its define some general information, In the subclass it must be override. It it's many form.(It supports single Inheritance))

2. Interface( same as above but supporting multiple inheritance )

3. Method overloading( In the class having a method is same return type but different signature )

Ex:Consider Birds like crow, parrot, peacock etc.. all r different but coming under a common name called birds likewise polymorphism is nothing but one in many form

Q:what is difference between string, stringbuffer and stringbuilder?

Example of polymorphism.
1. Method overloading
2. Method overriding(Dynamic dispatchment method)
3. Constructor overloading

polymorphism means existence of more than one form.
we can achieve polymorphism in run time as well as compile time.

overloading is the way to achieve polymorphism at compile time.

using overriding we can achieve polymorphism in run time.

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