A watch is a timepiece that is to be worn on a person, as opposed to a clock which is not. The term now usually refers to a wristwatch, which is worn on the wrist with a strap, while a pocketwatch, the common type before World War I, is carried in a pocket and often has an attached chain to lift it out. Watches evolved in the 1600s from spring powered clocks, which appeared in the 1400s. In addition to the time, modern watches often display the day, date, month and year, and electronic watches may have many other functions.
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