- A watch is a small timepiece intended to be carried or worn by a person, so as to make the time immediately and conveniently available. It is designed to keep working despite the motions caused by the person's activities.
- Most inexpensive and medium-priced watches, used mainly for timekeeping, are electronic watches with quartz movements.
- 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.
- Watches evolved from portable spring-driven clocks, which first appeared in 15th century Europe.
- A great leap forward in accuracy occurred in 1657 with the addition of the balance spring to the balance wheel, an invention disputed both at the time and ever since between Robert Hooke and Christian Huygens.
- The concept of the wristwatch goes back to the production of the very earliest watches in the 16th century. Elizabeth I of England received a wristwatch from Robert Dudley in 1571.
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