Using polymorphism we can reduce maintenance of the system. It can achieve using * Method Overloading and * Method Overriding.

Polymorphism is a ability to take multiple forms. Poly means Many and morphism means forms. Inheritance : Without modifying existing class if we want to extend meaning of the class then we should use inheritance. -Parent class known as Super class and Child class known as Sub class. - To create sub class we should use "extend" keyword.

Polymorphism means one name multiple form... Poly stands for many and morph stands for form, interface,etc.