In the 1970s and 80s, Casio was best known for its electronic (including scientific) calculators and electronic musical instruments. Today, Casio is most commonly known for making durable and reliable digital watches.
A watch is a timepiece intended to be carried or worn by a person. It is designed to keep working despite the motions caused by the person's activities. A wristwatch is designed to be worn around the wrist, attached by a watch strap or other type of bracelet.