Printer
The printer is an output device which can print data (pictures, documents etc.) to paper with ink (grayscale or coloured).
Speakers
Speakers can output sound from a computer using digital data to recreate sounds.
Monitor
A computer monitor can take data from a GPU and print it to its screen at around rates of 60-70 Hz. You can also have a multi-monitor setup to greatly increase resolution and viewing area. It also enables you to view to full screen programs at the same time which can be extremely useful to graphic designers e.g. they might want to see Flash at the same time as Photoshop.
Projector
A projector also takes data from the GPU and the projector projects it using light which allows it to be displayed on whiteboards etc. for a bigger view.
Mobile Phones
Mobile phones can also be used as output devices for the computer to send data to for the phone to store or display.
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