When we talk about sport we should distinguish between sport and games. Sport includes all kinds of physical activities in which people or team play against each other and try to win. It also might involve racing, such as in swimming, horse racing, climbing and athletics. Games are usually played between two people or two teams. A game is played according to a set of rules and a referee or umpire makes sure the players obey the rules and decides who has won. The most popular games are football, basketball, baseball, ice hockey, tennis and golf.