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A Bus is a subsystem that is used to connect computer components and transfer data between them. For example, an internal Bus connects computer internals to the motherboard. A “bus topology” or design can also be used in other ways to describe digital connections.

A Bus may be parallel or serial. Parallel buses transmit data across multiple wires. Serial buses transmit data in bit-serial format.

Source: https://www.techopedia.com/definition/2162/bus