An interface defines the communication boundary between two entities, such as a piece of software, a hardware device, or a user. It generally refers to an abstraction that an entity provides of itself to the outside. This separates the methods of external communication from internal operation, and allows it to be internally modified without affecting the way outside entities interact with it, as well as provide multiple abstractions of itself. It may also provide a means of translation between entities which do not speak the same language. Because interfaces are a form of indirection, some additional overhead is incurred versus direct communication.
The interface between a human and a computer is called a user interface. Interfaces between hardware components are physical interfaces.
The interface between you and the question you obviously could have found the answer to elsewhere, besides posting this kind of question in this forum, is called an "indirect mental abstraction" interface, (this usually has a lot of issues)
Bill
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