An automatic watch is a mechanical watch that eliminates the need for manual winding, as the mainspring is wound automatically from the energy provided by the natural motion of the wearer. Excessive or improper manual winding can wear out your watch, which is avoided if you opt for an automatic watch instead. The fact that no batteries are necessary for an automatic watch is also preferred by many wearers. Automatic watches are also known for their long lifespans, making them a worthwhile investment.