 It is different from a scrollbar in that it is not continuous but used to adjust a value without changing the format of the display or the other information on the screen.Sliders are also combined with progress bars in the playback of streaming media over a network connection (e.g., YouTube videos) in order to show the content buffering position versus the playback position.This is done by superimposing a colored shaded area (progress bar) on top of the slider, indicating whether the user can "jump" forward or not.