A mouse wheel is a small cylindrical device located between the buttons of a computer mouse. It allows users to scroll through documents, web pages, and other content by rolling the wheel up or down. This feature enhances navigation and improves user experience, especially when dealing with long lists or extensive text. The mouse wheel can also serve as a button, enabling additional functions when pressed. Many modern mice come equipped with a scroll wheel that may include features like tilt scrolling or customizable settings. This makes the mouse wheel a versatile tool for both casual users and professionals in various fields.