An interface refers to the designated point of interaction with a component. Interfaces are applicable at both the hardware and software level. --- It also refers to the language-element `interface`, which is the sole exception to single-inheritance in Java, C# and similar languages.

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The most important concept in software engineering is the concept of an interface. This article is not about interfaces in Java, it is about interfaces in software design, and to a lesser extent, interfaces anywhere in the universe. There are many other important concepts used in software development, but I would argue that many of them actually end up relating back to why interfaces are so important.