A touch screen is a display device which allows the user to interact with a computer by touching areas on the screen.
What are touch screens
Touch screens are electronic visual displays, you control them with multi-touch gestures, you do this by touching the screen with your finger or using a stylus or pen. Some touch screens use special gloves and others only work by using a special pen. You use touch screens to interact with your device and to control how it is displayed, for example pinching your screen to zoom into an image.
Touch screens enable the user to interact with their device and what is directly displayed, instead of using a mouse, touch pad or any other intermediate device.
Touchscreens are common in game consoles, all-in-one computers, tablet devices, and the most common smart phone.