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A bus is just a collection of wires or a means to carry data. The term came from the old days when the main board only had traces and sockets, and no real components. The backplane resembled the "bus bars" in a telephone system. Now, a bus is generally traces on a motherboard or a type of interface.

Serial here refers to data being sent end-wise, one bit at a time. If it were parallel, at least one byte would be sent at a time.

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10y ago

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