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A bus is a group of wires, of a number that is compatible with the size of data that the computer works with.

If the computer works in bytes then the bus would have to be 8 wires wide.

If the computer works in Words then the bus would have to be 16 wires wide.

If the computer works in double Words then the bus would have to be 32 wires wide. and so on.

This allows the computer to send a 'block' of related information at a time.

Now there are several different devices in a computer's hardware that may all work with the same size of data. So it would (or does) make sense to use one bus for all such transfers between these devices, otherwise you would have a lot more wires in a computer than what you really need.

So devices share the bus. Only the source and destination device are enabled for use at the same time while all other devices are disabled.

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