Serial communication may follow a horizontal path as well as a vertical path.

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Serial communication can follow a horizontal path, which means data is transmitted between two devices located next to each other, for example, between two computers on a local network or two devices connected by a serial cable. It can also follow a vertical path, which means data is transmitted between devices at different levels, such as from a microcontroller to a computer or from a sensor to a microcontroller.

Serial Communication May Follow a Horizontal Path as Well as a Vertical