What term describes the interconnection between two separate systems?

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Interfacing describes the point where two separate systems meet and can exchange information. An interface defines the shared boundary and the method by which data, commands, or signals are translated so both sides can understand each other. This is why the term is used to describe the connection between two systems in computing and healthcare tech: it’s the mechanism that enables interoperability, whether through software APIs, hardware connectors, or user interfaces. The other choices describe navigation (a main menu), something fictional (hyperspace), or a specific record or hardware register (MAR), none of which describe the linking mechanism itself.