the objects which are basic runtime entities. Class is a collection of objects. Data abstraction is nothing but revealing the essential features without telling about the background details. Inheritance is about the aquiring the properties of a parent class. Polymorphism itself tells that many forms of behavior. Dynamic Binding is the linkage of procedure call to the main code to be executed. Message passing explains how the communication takes place . These are the main concepts of object oriented programming language through c++ .