Chapter 2. Introducing Interfaces
A class's interface, speaking abstractly, is the collection of methods and fields that a class permits objects of other classes to access. This interface usually represents a commitment that the methods will perform the operation implied by their names and as specified by code comments and other documentation. A class's implementation is the code that lies within its methods.
C# elevates the notion of interface to be a separate construct, expressly separating interface (what an object must do) from implementation (how an object fulfills this commitment). C# interfaces allow several classes to provide the same functionality, and they open up the possibility that a class can implement more than one interface.
Several ...
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