Drug delivery is a way to give medicine to someone who needs it. Think of it like delivering a present to your friend, except the present is the medicine that can make them feel better if they are sick or hurt.
There are many different ways to deliver medicine. One way is to swallow a pill. The pill has medicine inside that your body will absorb and use to help you feel better. Some medicines can also be given through a shot or injection. This is like getting a tiny pinch, but the medicine goes right into your body to work quickly.
For some people, like babies or people who have trouble swallowing pills, there are special ways to give medicine. Sometimes it can be given through a tube that goes into your nose or mouth and down into your stomach. Other times it can be made into a liquid that can be given with a dropper or syringe, which is like a tiny tube that sucks up the medicine and then you can squirt it into your mouth.
Scientists and doctors are always trying to find new ways to deliver medicine to help people in the best way possible.