• A bus is a computer subsystem that connects and transfers data between computer components. A bus can be serial or parallel. Data is transmitted across many cables using parallel buses. Serial buses employ a bit-serial format to convey data.
• Originally, a bus was an electrical parallel structure with conductors connected to identical or similar CPU pins, such as a 32-bit bus with 32 wires and pins. The first buses, also known as electrical power buses or bus bars, were wire networks that connected peripheral devices and memory, with one bus dedicated to peripherals and the other to memory. Each bus has its own set of instructions, protocols, and scheduling.

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