Object-oriented programming (OOP) is a programming paradigm that uses "objects" ? data structures consisting of datafields and methods together with their interactions ? to design applications and computer programs. Programming techniques may include features such as data abstraction, encapsulation, modularity, polymorphism, and inheritance. It was not commonly used in mainstream software application development until the early 1990s.Many modern programming languages now support OOP.Ex.,C++,Java etc.,