Final answer:
An output device is a peripheral device used to communicate information or data from a computer to the outside world. The keyboard is not an output device, while the pen plotter, data projector, and dot-matrix printer are all examples of output devices.
Step-by-step explanation:
An output device is a peripheral device that is used to communicate information or data from a computer to the outside world. It allows users to receive information or data that has been processed or stored by the computer. Out of the options provided, the keyboard is not an output device. It is an input device that allows users to enter data or commands into the computer system through key presses.
The pen plotter, data projector, and dot-matrix printer are examples of output devices. A pen plotter is a type of printer that uses one or more pens to draw graphics on paper. A data projector is a device that projects images or video onto a screen or wall, and a dot-matrix printer is a type of printer that produces characters or images by striking pins against an inked ribbon.
Learn more about output devices