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2. The main memory holds the instructions and data which
are being processed by the CPU. It has two main sections:
RAM
(random access memory) and ROM (read only memory).
3. Peripherals are the physical units attached to the computer.
These can include input devices, output devices, storage devices
and communications devices.
Input devices, which let us enter data and commands (e.g.
keyboards, mouses, scanners, barcode readers, microphones,
webcams (small digital video cameras used on the Web).
Output devices, which let us extract the results (e.g. monitors,
printers, plotters, loudspeakers, headphones).
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