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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.
In general, an average watch wearer's motion is enough to power an automatic watch for 2-3 times as many hours as it is actively worn. If you wear your automatic watch at least 10-12 active hours 7 days a week, you should maintain 50% (about 20 hours) of power reserve by the end of the day when you take it off. It does not hurt an automatic watch to manually wind it every once in a while to make sure its power reserve is 'topped off.'.