A Slider is a graphical user interface that allows a user to select a value from a given range of values by dragging the slider knob, or button. A slider is preferred when the user is likely to alter the value of a parameter, or a configuration, frequently in order to analyse its effect on a system. For instance, adjusting the hue of a visual object by varying its RGB channels is faster using a slider than it is by setting the values manually.
A slider is also preferred when it would be cumbersome to enter the required value manually. For instance, it makes more intuitive sense to adjust the volume on a multimedia application using a slider than it is by setting the required decibels manually.
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