Adverse event

Okay kiddo, so an adverse event is when something bad happens that wasn't supposed to happen. Let's say you're playing with your toy car and you accidentally bump your head on the table. That's an adverse event. It wasn't what you planned and it wasn't something you wanted to happen.

Now let's say you are taking medicine because you are not feeling well. If you start feeling worse or you have a reaction to the medicine, that's also an adverse event. It means something bad happened because of the medicine.

In the grown-up world, we have to be careful about adverse events because they can happen in all sorts of situations, like in medicine or in complicated machines. People study these events and how to prevent them from happening in the future. It's important to try and avoid adverse events so that everyone stays safe and healthy.