Think of your body as a castle. Inside this castle, there are many guards called your immune system. These guards work hard to keep bad things out. Sometimes, tiny invaders called germs try to sneak into the castle. When germs get in, they can cause an infection. This is like if the germs are trying to take over your castle, and your guards have to fight them off to keep you safe.

Now, imagine your body is like a garden. In this garden, you have lots of beautiful flowers and plants that need to be healthy. Sometimes, pesky weeds can grow and start to take over. These weeds are like germs. When they grow too much, they can make the garden sick. Your body works hard, like a gardener, to pull out the weeds and keep the garden healthy and free from infection.

Picture your body as a computer. It runs smoothly when everything is working right. But sometimes, a virus can sneak in and cause problems. This virus is like an infection. Your computer has special programs to find and fix the virus, just like your body has ways to fight off infections and make you feel better.