􀁹 Instance variables: the attributes for each object of class the same.

􀁹 Each object has a value and save your own attributes.

􀁹 So every object of the same class which may have value same or different

􀁹 Class variables: the attributes for all objects created from the same class.

􀁹 All objects have the same attribute value.

􀁹 Thus, all objects of the same class has only one same value.