Okay kiddo, let me explain the International Biathlon Union (IBU) in a way that you can easily understand!
You know when you watch the Winter Olympics and you see people skiing and then shooting a gun? That's called biathlon! The IBU is the group of people who organize and manage all the biathlon races around the world, like a big boss.
Just like in school, the IBU has rules and regulations that all the athletes and races have to follow. They make sure that all the races are fair and safe for the athletes, by checking things like the temperature and weather conditions before each race.
The IBU also looks after things like organizing the World Cup, World Championships, and Olympic Games. They make sure that everything runs smoothly and that all of the athletes have a chance to compete at their best.
Overall, the IBU is like the teacher in charge of a big sports game, making sure that everything is fair, safe, and fun for everyone involved!