An "input" is the information that goes
"in" a system. This information can be processed
or can be designed to do something to the system.
Once we have a result, it goes "out" of the
system, and we call it "output".
You push a button on your computer keyboard,
that is an "input", the result of pushing that key
is going to be displayed on the monitor of your
computer, that is the "output".
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