input/output device usually layered on the top of an electronic visual display / From Wikipedia, the free encyclopedia

A touchscreen is a computer screen that can be used by touching it with a finger or a stylus pen, instead of using a mouse and keyboard. It can be described as a touchpad with a screen built-in to it.

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Today, all kinds of devices, both big and small, make use of touchscreens. However, tablet computers and smartphones have made them popular and are the most widely known and used products that use touchscreens.