Answer:
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.
The
CPU moves data around the computer on pathways that interconnect it to all the
other components on the motherboard. These pathways are called 'buses'.
The
internal bus carries data within the motherboard.
External
buses carry data to peripherals and other devices attached to the motherboard.
The
lines or pins of a bus are of three types:
Address
- the components pass memory addresses to one another over the address bus.
Control
- used to send out signals to coordinate and manage the activities of the
motherboard components.
Data
- transferred between peripherals, memory and the CPU. Obviously, the data bus
can be a very busy pathway.