Colonialism is a type of rule where one country or group of people take control of another country and its people. This often happens when the more powerful country wants to take advantage of the other country's resources.
The Olympic Games are a sporting event that happens every four years and brings together athletes from all around the world to compete against each other.
The way colonialism and the Olympic Games are connected is that in the past, during the time of colonialism, some countries used their power over other countries or people to try to gain an advantage in the Olympic Games. Countries that were in control of other countries would often send athletes from those countries to compete in the Olympic Games, giving those countries an unfair advantage. This isn't allowed anymore and the Olympic Games now try to make sure all athletes have a fair chance at competing.