Why do we need on output device?

Output devices provide data in myriad different forms, some of which include audio, visual, and hard copy media. The devices are usually used for display, projection .

for Example :

Monitors and printers are two of the most commonly-known output devices used with a computer.

Explanation:

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We need on output device because output devices receive information from the computer, and carry data that has been processed by the computer to the user. It's provide data in myriad different forms, some of which include audio, visual, and hard copy media.

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