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exists and is an alternate of . Making the world better, one answer at a time. If by IT you mean computer architecture, then the communication bus would be a physical path on the circuit board, that connects various components which passes electrical signals between each other. The nature of the signal is either on or off and the path is either serial or parallel in nature.
In general, the term is used in two somewhat different contexts: (1) A bus is a network topology or circuit arrangement in which all devices are attached to a line directly and all signals pass through each of the devices. Each device has a unique identity and can recognize those signals intended for it.