Polymorphism

• Literally means ``many forms''.
• A method can have many different forms of behavior.
• Commonly used between a set of classes that have a common superclass.
• The sender of a message does not have to know the type/class of the receiver.
• A single operation or attribute may be defined upon more than one class and may take on different implementations in each of those classes.
• An attribute may point to different objects at different times.