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A scroll wheel is a wheel on a computer mouse that is used to scroll through content on a screen without using the scroll bar. Rolling the wheel up or down sends signals to the computer to move a webpage or document accordingly. Many scroll wheels can also be pressed down, which often acts as a third button to perform actions like opening a link in a new tab, and some can be pressed side-to-side for horizontal scrolling.

Function: Allows users to scroll vertically through documents, web pages, and other content.

Location: Typically located between the left and right mouse buttons.

Middle-click functionality: Pressing the wheel down can act as a third mouse button, with functions that vary by application. A common use is to click on a link to open it in a new tab.

Horizontal scrolling: Some advanced mice allow for side-to-side scrolling by tilting the wheel.

Customization: The scroll speed and other functions can often be customized in the computer's settings.