Touchscreen is an electronic visual display that can detect presence in the display area. This is an input device. It is usually touched with a finger or pen-shaped stylus. All types of computers , tablet computers , smart mobile phones have touch screen system inside one. Data can be input quickly by touching the touch screen , various instructions can be given. It can be done by clicking with the mouse or by touching the screen directly without the touchpad medium. The touch screen of the touch screen is covered by a plastic layer behind which the invisible rays and infrared light work.