Which of the following is an example of an output device?

An example of an output device is a printer. Output devices are designed to convey information from a computer to the user in a form they can understand or use. A printer takes digital data from a computer and translates it into a physical format, typically producing text and images on paper. This interaction exemplifies the role of output devices in delivering processed data that was generated and managed by the computer.

In contrast, the other options represent input devices. A keyboard is used to input text and commands into a computer, while a mouse allows for navigation and input through pointing and clicking. A scanner converts physical documents into digital format, making it an input device as well. By understanding these definitions, it becomes clear why a printer is categorized as an output device.