A computer mouse is a handheld device used to interact with a computer's graphical user interface. It typically has two buttons and a scroll wheel, allowing users to click, select, and navigate through various applications and files on the screen. The mouse can be connected to a computer via a wired or wireless connection. When moved across a flat surface, the mouse translates its movement into cursor movement on the screen. This makes it easier for users to perform tasks such as clicking on icons, scrolling through documents, and dragging items. The mouse is an essential tool for both casual and professional computer users.