How does the immune system protect our bodies from disease?

The immune system is like a superhero team that helps keep our bodies healthy and strong.

Imagine your body is a castle, and every time you get sick, it's like a group of robbers are trying to sneak in. The immune system is the guards and knights who stop them before they can do any damage.

When germs, like viruses or bacteria, try to enter your body, special cells called white blood cells notice them. These white blood cells are like detective cops who catch robbers in the act. They might even swallow up the bad guys or send out a signal to call for more help.

Sometimes, the immune system needs extra power. It sends out messengers that tell other parts of the body to join the fight, kind of like when your friends come over to help you beat up the bullies at school.

Once the bad guys are gone, the immune system remembers them so it can stop them from coming back again, just like how you remember the bullies so you're ready next time they show up.