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Report Abuse. In computer architecture, a bus is a subsystem that transfers data between computer components inside a computer or between computers. Each bus defines its set of connectors to physically plug devices, cards or cables together.
In reality, each bus is generally constituted of 50 to 100 distinct physical lines, divided into three subassemblies: The address bus (sometimes called the memory bus) transports memory addresses which the processor wants to access in order to read or write data. It is a unidirectional bus. The data bus transfers instructions coming from or going to the processor. It is a bidirectional bus. The control bus (or command bus) transports orders and synchonisation signals coming from the control unit and travelling to all other hardware components.