Which of the following is considered an output device?

A monitor is considered an output device because it displays visual information generated by a computer. It translates digital data into a format that users can understand, presenting images, videos, and text that the user needs to interact with or analyze. This process allows users to receive feedback and view the results of their commands and input, making it a crucial part of the computer's operation.

In contrast, input devices like scanners and keyboards facilitate user interaction with the computer by inputting data. A webcam is also primarily an input device as it captures video data for transmission and recording. These devices serve different functions than output devices, which are specifically designed to present information generated by the system rather than collect or send data into it.