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A slider, also known as track bar in Microsoft literature, is an object in a GUI with which a user may set a value by moving an indicator, usually in a horizontal fashion.

In some cases the user may also click on a point on the slider to change the setting. It is different from a Scrollbar in that it is typically used to adjust a value without changing the format of the display or the other information on the screen.

The progress inside the slider is usually indicated with a color that distinguishes it from the rest of the slider, including the indicator, and is usually shown to inch slightly faster than the indicator.