What is an interface?

Before going forward, let me make myself clear that when I use the word interface, it is not the end-user interface that has visual components, rather it is a bridge that developers use underneath their heap of classes to interact with other classes. Defining an interface allows a component of the system to communicate with another without knowing how it has been implemented. A good analogy would be a computer hardware repairer who does not have to know how a circuit board is designed in the hard disk or the mother board as long as he knows that if he replaced it by a new one with the correct specification, it would work perfectly. The same principal can be applied in software engineering. You write your own world changing algorithms and expose it to other developers via an interface to integrate into their different user interfaces. It can be an ASP.NET application or a Windows based form or even a mobile device based application. It opens a whole new world to components based programming. Like our hardware repairer, we can have software components designed and implemented. These components can be the building blocks of our new enterprise applications.

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http://www.codeproject.com/Articles/160441/Using-C-Interfaces-to-Make-Applications-Resilient