A computer mouse is an input device used to control a cursor or pointer displayed on a screen, translating physical movement into digital coordinates. Functionally, it facilitates interactive command selection and navigation within graphical user interfaces. Modern implementations employ various sensing technologies, such as optical or laser arrays, which track movement across a surface by detecting minute changes in light reflection or surface texture. These devices are connected to a host computer via interfaces like USB or wireless protocols, allowing the user to interact with computing systems by moving the cursor in relation to the physical input device.