In many countries (especially Canada, the USA and the Scandinavian countries), hockey refers to a game played on ice with a small rubber disc called a puck (see the article on ice hockey). Field hockey is played on turf using smaller sticks and a ball.
Unihockey is played in sport halls.
roller hockey is a variant of ice hockey that is played on concrete or asphalt using in-line roller skates.
Air hockey is played on tables indoors.