Touch screens accept input by allowing the user to place a fingertip directly on the computer screen, usually to make a selection from a menu of choices. Most touchscreen computers use sensors on the screen's surface to detect the touch of a finger, but other touch screen technologies are in use, as well.
Touch screens work well in environments where dirt or weather would render
keyboards and pointing devices useless,
and where a simple, intuitive interface is
They are well-suited for simple
applications, such as automated teller machines or public information kiosks
(see Fig. 1
Fig. 1: public information kiosk.
Touch screens have become common in fast-food restaurants, department stores, drugstores, and supermarkets,
where they are used for all kinds of purposes, from creating personalized greeting
cards to selling lottery tickets.