Hockey is a game in which two opposing teams use sticks to move a small object into the opposing goal. The two major types of the sport are field hockey and ice hockey. Field hockey is played on a open area, traditionally grass but more modernly an artificial surface, and using a ball. Ice hockey is played on an enclosed ice surface, traditionally an iced-over lake or pond but more modernly an artificial rink, and using a small rubber disc called a puck.
For further information on each, see the related questions.