Which accessory connects with a computer to enhance its visual capabilities?

The monitor is the accessory that connects with a computer to enhance its visual capabilities. Monitors display the visual output from the computer, allowing users to view graphics, videos, text, and user interfaces. They are essential for interaction with the computer, as they provide a medium through which information is presented visually.

Printers, on the other hand, are designed for producing physical copies of documents, maps, or images stored on a computer, without directly enhancing how the content appears on screen. Speakers serve to output audio, which, while important for a complete multimedia experience, does not contribute to visual capabilities. A mouse is an input device that allows users to interact with the computer but does not enhance the computer's ability to display visuals.

Hence, the monitor plays a critical role in enhancing the overall visual experience when using a computer.