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Classes and objects are separate but related concepts. 

Every object belongs to a class and every class contains  one or more related objects. A Class is static. The attributes of a class don't change. An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that lifetime, the 

attributes of the object may undergo significant change. A class is a general concept while objects are the specific and real instances that embody that concept