What does the term "touchpad" refer to in a laptop?

The term "touchpad" refers to the built-in input device found on laptops that allows users to control the cursor on the screen without the need for an external mouse. It serves as a substitute for a traditional mouse by translating finger movements into cursor movements. The touchpad is typically located below the keyboard and is sensitive to touch, allowing users to navigate, click, and scroll by using finger gestures.

In contrast, other options address features or peripherals that do not directly describe the function of a touchpad. An external mouse is a standalone device used for cursor control, a keyboard function refers to the input from keys on the keyboard, and screen resolution pertains to the clarity and detail of the display rather than any input method. Thus, the correct choice accurately identifies the role of the touchpad as the integrated pointing device in a laptop.