There are *a ton* of different types of bacteria all over and inside of everything.
When you get an infected cut, that is some microbe trying to eat/live inside of you and your body is fighting back.
Antibiotics are chemicals that disrupt bacteria’s ability to function but let your own cells go on normally. These help your body fight the infection.
However, there are other bacteria that are not only not harmful, but are actually important to the functioning of your body. For example, your intestines host bacteria that help break your food down.
Antibiotics will kill these guys, too. This is why people often say to take probiotics (basically things that are full of a lot of these helpful bacteria) after a round of antibiotics that likely killed most of them off.
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