Being immune is like having a special superhero inside your body that protects you from getting sick. Imagine you have a team of tiny superheroes, like your favorite cartoon characters, who are always ready to fight off the bad guys, which are germs and viruses. These superheroes are called your immune system. They wear special armor and have cool gadgets to stop the bad guys from making you feel yucky.
Think of your immune system as a castle with strong walls and guards. The walls keep the bad germs out, and the guards stand watch to make sure nothing sneaks in. If a germ tries to break through, the guards quickly catch it and throw it out. Every time they fight a new germ, they learn how to stop it even better next time.
Another way to think about being immune is like having a library of books about every germ you’ve ever met. When a germ tries to make you sick, your immune system reads the right book to remember how to fight it. This way, you can stay healthy and keep playing with your friends.