A watch is a small, portable timepiece, especially one worn on the wrist or carried in the pocket. A wristwatch is fastened to the wristwith a strap or bracelet. A pocket watch is typically a watch on a chain, intended to be carried in the pocket of a jacket or vest. Watches track and display the passage of time or "the time" (meaning hours, minutes and (sometimes) seconds), though a wide range of watches are capable of displaying calendar day, day of week, year or sub-second units like 1/10 or 1/100 of a second. Watches that provide additional time-related features such as timers, chronographs and alarm functions are not uncommon. Some modern designs even go as far as using GPS technology or heart-rate monitoring capabilities.
Before wristwatches became popular in the 1920s, most watches were pocket watches, which often had covers and were carried in a pocket and attached to a watch chain or watch fob. Watches evolved in the 17th century from spring powered clocks, which appeared in the 15th century.
source: http://en.wikipedia.org/wiki/Watch
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