What is the primary function of a monitor?

The primary function of a monitor is to display output from a computer. It serves as the visual interface through which users interact with their computer's operating system and applications. By translating digital signals from the computer's graphic card into images, text, and videos, the monitor allows users to view the results of their actions, whether that's writing a document, browsing the internet, or playing a game.

The other options describe functions that pertain to different devices: producing paper copies relates to printers, enhancing audio clarity is a role for speakers or sound systems, and storing digital information relates to hard drives, SSDs, or other forms of data storage. Thus, none perform the visual display functionality that is inherent to monitors.