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

A monitor is classified as an output device because it displays visual information processed by a computer. The primary function of an output device is to convey information from the computer to the user, and the monitor fulfills this by showing images, videos, and graphical user interfaces. It translates the data that the computer processes into a form that users can understand and interact with, such as text and graphics.

In contrast, a scanner is an input device that captures images or documents to be processed by a computer. A mouse is also an input device, as it allows users to interact with the computer's interface by moving a pointer on the screen. Similarly, a keyboard is another input device, enabling users to input text and commands into the computer. Thus, it is clear that a monitor serves a distinct role as an output device, providing essential visual feedback to users.