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A class can be described as the main building block of OOP. It too serves as a template which defines the states, behavior and properties, familiar to a particular set of objects.
A class also defines the features of objects, plus the methods which execute the actions of member objects. It is a complete data type that signifies a blue print of objects. It is also a template of object. The class holds behavior and data of entity. Such as, aircraft class could contain data, like category, model number, and color and activities, like duration of flight, speed, and number of travelers. Class takes over the behaviors and data members of additional classes by extending from them.