The World Organisation for Animal Health (OIE) is like a big group of friends who care about animals. They work together to make sure animals all around the world are healthy and happy.
Just like when you visit the doctor or the nurse when you are sick, the OIE helps keep animals from getting sick and helps them get better if they are already sick. They have rules and guidelines that everyone who takes care of animals should follow.
It's important that everyone works together to keep animals healthy because animals are very important to us. They give us food, help us on farms, and are even our pets! So when they get sick, it can be really bad for us too. That's why the OIE is there to help.