OOPS is concept is mainly for reusabililty of Objects.The Objects like Class Structure Object Methods Function Property Interface Abstract and Inheritance. All the things for the concept Max gain with Min pain.
Polymorphism is the one of the concept in OOPS.Polymorphism means one entity existing in multiple forms. It provides flexibility to application systems. It simplifies coding and reduces the rework involved in modifying and developing an application. It refers to the ability of an object to take on different forms depending upon the situation.