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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.
The internal bus, also known as internal data bus, memory bus, system bus or Front-Side-Bus, connects all the internal components of a computer, such as CPU and memory, to the motherboard. Internal data buses are also referred to as a local bus, because they are intended to connect to local devices.