OOPs or Object Oriented Programming is an approach that puts object at the center of programming model. An object is a self contained entity that has a state and behaviour. State is described by fields and properties, while behavior is defined by methods and events. Object is an instance of a class. A class acts like a blueprint for the object . It defines behavior of object of that type.So all objects of type Vehicle will have the same behavior. Vehicle class will have the properties - 'color' , 'weight', 'model', 'make' . Properties are characteristic shared by all objects of a particular class. Methods are actions of an object - 'start', 'stop' Constructors are special kinds of methods, used to initialize objects. It executes automatically when a class is instantiated Access modifies helps in controlling the visibilty of a class. * Public allows the property or methods to be called outside the class * Private fields and