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A compass is a small weak magnet having a north pole and south pole. It is fixed at its center and free to rotate. Due to the earths, magnetic poles and attraction due to magnetism of earth, the compass turns and aligns itself along the north south direction.
North pole of the compass points towards south pole of earth. South pole of compass points towards north pole of earth.
On the north pole of compass it is written South of earth. South pole of compass it is writen North of earth.

A compass is a device used to determine the direction.
There is a small magnetic needle in a compass. Its tip gets attracted towards the north direction beacuse of the magnetic field of the earth.