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Automatic watch. An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of the natural motion of the wearer to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Most mechanical watches manufactured today are self-winding.
An automatic watch is a watch that continues to operate due to the regular motion of the wearer's wrist. Automatic wristwatches don't need winding if worn daily. The energy is stored by using a half-disc metal weight, called a rotor, that spins when the arm is moved.