A tablet is basically a board you plug into your computer and use a tablet pen to draw on, or to simply replace the mouse. Wherever you move the pen on the board, the cursor on your screen moves to the same location (ex; if you put the pen at the corner of the tablet board, the cursor moves to the corner of the screen). You can read more about tablets here; http://en.wikipedia.org/wiki/Digitizing_tablet
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A graphics tablet is an input device consisting of a flat, pressure-sensitive pad that the user draws on. A stylus is usually used on these so as not to add finger prints.