Slider (computing)
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A slider 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.
Usage with progress bars
Sliders are also extensively combined with progress bars in the playback of Internet video and Internet radio to allow the user the ability to shift to points within the media as far as the current extent of the download (which is indicated by the progress in the bar) will allow.