The IOC  (International Olympic Committee) is the organisation that governs the games. It decides which sports and events are held at the games. The IOC also selects the host city for the summer and winter games, at least seven years before they take place. Cities that want the games must show that

• they have enough stadiums for all events
• they have enough room for all the athletes
• they can provide safety for the athletes
• they can transport athletes and spectators from one event to another
• Host cities must build an Olympic village where all athletes live during the games.