Which of the following devices is essential for navigating a computer interface?

The mouse is essential for navigating a computer interface because it allows users to interact with the graphical elements on the screen. It provides a way to move the pointer around the display, select items, open menus, and execute commands through clicks. The mouse enables precision and ease of control in graphical user interfaces, making it a vital tool for effective computer navigation.

While other devices are important for different functions—such as a monitor for displaying information, a printer for producing physical copies of documents, and a speaker for audio output—they do not play a direct role in the navigation of a computer interface. The monitor is necessary for visual feedback, but a user cannot effectively navigate without the functionality that the mouse provides.