The European Medicines Agency is like the boss of all medicines that are used in Europe. Just like you have a teacher who watches over you and makes sure you do your work in school, the European Medicines Agency checks on the medicines before they are used by people.
Before a medicine can be used in Europe, the company that makes it has to show the European Medicines Agency that the medicine is safe and it really works. The European Medicines Agency then checks what the company has shown and makes sure all the information is correct.
If the European Medicines Agency is satisfied that the medicine is safe and it works, then it gives permission for the medicine to be used in Europe. Once the medicine is allowed to be used, the European Medicines Agency still watches over it to make sure it is safe and effective for people.
In conclusion, the European Medicines Agency is like the teacher who checks all the medicines that are used in Europe to make sure they are safe and work properly.