A graphic tablet is an input device used to draw a picture on a computer screen without a mouse or keyboard.
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Tablet is a square/rectangular area based input device. A mouse moves over the tablet. The tablet senses the movement of the mouse or any other device on top of it, those movements are conveyed to the computer. Any program reading the current position and the change of position of the mouse on the tablet - gets it and UPDATES the cursor to that point.
Cursor is the blinking vertical line displayed at the current position in  a document or a ARROW shown on a picture.

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