A wristwatch is a small timepiece designed to be worn on a wrist, attached by a watch strap or other type of bracelet.
Watches were first available in the 17th century evolving from spring-powered clocks, which appeared as early as the 14th century.
The first watches were strictly mechanical, driven by clockwork.
These are now largely superseded by vibrating quartz crystals that produce accurately timed electronic pulses.
Some watches use radio clock technology to regularly correct the time.
The first digital electronic watch was developed in 1970.
Most inexpensive and medium-priced watches, used mainly for timekeeping, are electronic watches with quartz movements.
Modern watches often display the day, date, month and year, and electronic watches may have many other functions.
Watches which have GPS receivers use them not only to determine their position. They also receive and use time signals from the satellites, which make them essentially perfectly accurate timekeepers.
Developments in the 2010s include smartwatches, which are elaborate computer-like electronic devices designed to be worn on a wrist.
Expensive collectible watches, valued more for their elaborate craftsmanship, aesthetic appeal and glamorous design than for simple timekeeping, often have purely mechanical movements and are powered by springs, even though these movements are generally less accurate and more expensive than electronic ones.