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A computer program is a set of instructions provided to and executed by a
computer. Computer programs are written in a
programming-language by a computer
Most computer programs are intended to
transform data from an unused form to
a useful form.
Computer programs follow a common pattern:
Graphical programs follow this pattern within an event loop.
They take touch, keyboard or mouse events as input and
draw on the screen for output.
Web programs follow this pattern within the request/response
cycle. They take an http request as
input and provide an http response as output.