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Good? You need to be more specific - computer (API) changes what you see on the screen to - readable computer language, machine or binary. Which has two choices on or off or 0 or 1 or positive vs negative (or plain English is the light off or on). Her is a better question: A digital signal composed of a pulse of positive voltage represents an 1 or a positive.

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Q: What is it called when the computer changes data into something useful?
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