Which of the following is considered an input device for computers?

A mouse is considered an input device for computers because it allows users to interact with the computer's graphical interface. By moving the mouse, users can control the cursor on the screen, which enables them to click on icons, open programs, and navigate through various applications. The essential function of input devices like the mouse is to send data and commands to the computer, facilitating user interaction and control.

In contrast, a monitor displays the output from the computer; it does not provide input. Similarly, a printer serves to produce physical copies of digital documents, representing an output function, while speakers output audio signals generated by the computer rather than input information. These distinctions highlight the role of the mouse as a crucial tool for user input in operating computer systems.