what are touch screens?
A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure; a user interacts with the computer by touching pictures or words on the screen. Surface wave technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touch screen panels are the most advanced of the three types, but they can be damaged by outside elements.
the most popular touch screens are made by a company called apple they have made ipads iPods iPhones iPod Nanos and many more which are all touch screens. Steve jobs invented apple but apple did not make the fist touch screen Sam Hurst did
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there are other makes of touch screens such as Samsung and tablets