ELI5: Explain Like I'm 5


Bacteria are really small living things that you can't see without a special tool called a microscope. They are all around us and on us even though we usually can't see them. Even though they are so small, bacteria are living things, so they do things like eat and multiply. They can also cause sickness if they get into your body, so it's important to wash your hands and not eat food that has been left out for too long!
Related topics others have asked about: