Give an example of an output device.

The monitor is an essential output device because it displays visual output from a computer, allowing users to see the results of their operations, interact with programs, and view media. It takes processed data from the computer and converts it into images, text, or videos that can be interpreted by the user. This function is critical for a variety of tasks, such as browsing the internet, using productivity software, or watching videos, making the monitor one of the most commonly used output devices in computing.

In contrast, keyboard, scanner, and mouse are primarily input devices. A keyboard allows users to input text and commands, a scanner converts physical documents into digital format for the computer, and a mouse enables users to interact with the computer's interface by navigating and selecting items on the screen. Thus, while these devices are crucial for data entry and interaction with the computer, they do not serve the primary function of conveying output to the user like a monitor does.