[Public] describes a method or variable that can be called from outside the class. Data that is passed into or out of a method is known as a [parameter]. An [object] describes an instance of a class. Giving an action one name that is shared up and down a class hierarchy, yet is implemented in different ways is referred to as [polymorphism]. A [sub-class] is a type of class that inherits all the methods and properties from a base class..

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