Antibiotics are like magic medicine that fights against bacteria and can make you feel better if you are sick. But if we use these medicines too much or take them when we don't really need them, they won't work anymore. It is like when you eat too much candy and it doesn't make you happy anymore.
So, if we use antibiotics too much, then the bacteria become smart and starts to learn how to fight the medicine. This means that the next time you are really sick, the antibiotics may not work at all!
Also, sometimes people take antibiotics for things that they don't need them for, like a cold or the flu. Antibiotics only work against bacteria, not viruses, which are usually the cause of a cold or the flu. So, taking antibiotics when you don't need them can be harmful and not helpful at all.
That is why it is very important to use antibiotics only when they are needed and as directed by the doctor. You should always finish the full treatment course even if you feel better because this will make sure all the bacteria are killed. And remember, always wash your hands and stay healthy to avoid getting sick and needing antibiotics in the first place!