a pen and its used to input data
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An "Input Device" is anything that receives information and 'Inputs' it into the computer. The most basic are... * Keyboard * Mouse * Controller * Scanner * Microphone * Web Cam
A small pen-like device that uses pressure instead of ink is called a stylus. A stylus is used to operate touchscreen devices such as a Nintendo DS or an iPad.
Technically speaking, it isn't any more of either than your finger is an input device, or your lips an output device. The screen that the stylus is used on is both an input or an output device, sensing pressure from the stylus and displaying images as a result.
A stylus.
This is known as a tablet. It allows you to draw on your computer using a stylus. Also could be a light pen.