Touch Screens

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 important.
They are well-suited for simple applications, such as automated teller machines or public information kiosks (see Fig. 1).
public information kiosks
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.

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