Handling, processing, and representing data in the 2.0 era of web applications has become so crucial that designers and programmers are working towards new ways of improving the user interface experience.
Slider is one such killer concept, using which the user can represent and handle data easily.
A slider, according to the dictionary, stands for "the one that slides". Yes, a slider in the web application context stands for holding and sliding values from a fixed given range, or even from an array of values.
The slider is really useful and worthy in places where the user needs to slide through a lot of values and also the application needs to respond to those values and changes.