The International Science Olympiad is like a big test that kids from different countries take to see who knows the most about science. It's kind of like a big game where the players are super smart kids who love science and are really good at it.
Each country picks some of its smartest and most talented students to represent them in the competition. They study all year long to prepare for the big test. The test has questions about different parts of science like biology, chemistry, and physics.
The competition happens once a year, usually in a different country every time. When the students get there, they'll be mixed with smart kids from other countries. Everyone will speak different languages and have different ways of studying for the test, but they all love science and want to show how smart they are.
During the competition, the students will have to solve different problems related to science. They might be asked to do experiments or answer tricky questions. There is a lot of pressure on the students to do well, but they are also there to make friends and learn from each other.
At the end of the competition, the student who gets the most questions right from each country is awarded a medal. The medals are like trophies that show that the students are the best at science in their country.
Overall, the International Science Olympiad is like a really big science quiz show that brings together the smartest kids from around the world to compete and learn from each other.