Input and Output Devices
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Before a computer can
process your data, you need some method to input the
data into the machine. The device you use will depend on what form
this data takes (be it text, sound, artwork, etc.).
Similarly, after the computer has processed your data, you often need
to produce output of the results. This output
could be a display on the computer screen, hardcopy on
printed pages, or even the audio playback of music you composed on the
The terms “input” and “output” are
used both as verbs to describe
the process of entering or displaying the data, and as nouns referring
to the data itself entered into or displayed by the computer.
Below we discuss the variety of peripheral devices used for computer
input and output.