Casio was founded after WWII by Tadao Kashio. They are famous for their digital watches and collections like the G-Shock, that is a cultural icon. They also produce calculators and other gadgets, but digital watches are their real stand-out product, first produced in the 1980s in a wide variety of style. For example, there are watches with calculators, data banks, and video games. Casio is one of the 'big 3' Japanese watch brands that also includes Seiko and Citizen.