The **computer mouse** is a handheld hardware input device used to control a cursor in a graphical user interface (GUI). By moving the device across a flat surface, users can point to, click, drag, and select objects on a screen with precision. While early versions relied on a rolling internal ball, modern mice typically utilize **optical or laser sensors** to track movement. Available in both wired and wireless configurations, they often feature two main buttons and a scroll wheel, though specialized models for gaming or productivity may include additional programmable buttons and ergonomic designs to reduce hand strain.