Okay kiddo, have you ever seen those boats on the water with a bunch of people rowing really fast? That's called rowing! It's a sport where people use oars to move a boat through the water.
Now, sometimes rowers from all over the world come together to compete against each other. It's kind of like the Olympics, but just for rowing and only for young people who are under 19 years old. This is called the World Rowing Junior Championships.
There are different types of races in this championship, like ones where teams of rowers race against each other or ones where one rower goes by themselves. They have to go really fast and the first one to cross the finish line wins.
It's a big deal because the rowers get to represent their country and show off their skills in front of lots of people. It's also a great way for them to make friends from different countries and learn about different cultures. And who knows, maybe they'll even become professional rowers someday!