An interface is typically used in place of a MustInherit class when there is no default implementation to inherit.

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Quizplus · Accepted Answer

An interface defines a set of methods and properties that a class can implement, but does not provide any default implementation. It is used to define a contract for what a class should do, without specifying how it should do it. In contrast, a MustInherit class in VB.NET (or an abstract class in other languages) can provide a default implementation for some methods or properties, but cannot be instantiated on its own.

An Interface Is Typically Used in Place of a MustInherit