What is a Class?

In OOD, when we design objects to be used in a computer program, these objects become a class. You can think of a class as being a blueprint or a plan from which many objects may be created. For example, an architect may design a house plan, and from that house plan, a builder may build many houses. It is the same with a class. The blueprint for a object is called a class and they are represented using a class diagram.