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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.
Serial communication. Serial communication is a term used to describe systems used for telecommunications, as well as certain technologies used for computing. When using serial communication, only one bit is transferred at a time, for example over a communication channel or computer bus. This is different to parallel communication, where several bits are sent at the same time.