This is an input device which is often used by graphics designers and illustrators to work with images or hand drawn designs.
A graphics tablet has two parts. The first part is a slender slab that lies flat on the table. The second part is a special pen. The tablet can sense how the pen is moving around on its flat surface. By moving the pen around you are able to draw lines and pictures.
The computer must be running an application that can deal with the graphics tablet. For example Photoshop or CAD (Computer Aided Design) software.
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Click on this link: Graphics Tablet