L. P. with Microsoft C# - Level 3-Quiz-2

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Polymorphism is called when what appears to be a single method or a single member has multiple implementations, depending on the context in which the member is called.
abstract kind of class cannot be directly instantiated, but generally acts as a contract to ensure that certain methods are implemented in its derived classes.
You have created an abstract method as part of an abstract class. you need to put nothing after the abstract method to indicate no implementation.
You have a sub-class that has a method that the base class does not have. You can downcast the base class instance to an instance of the sub-class to allow you to call the sub-class method.

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