Eudralex is a big book that tells everyone in Europe how to make, test, and sell medicine. Imagine you are baking a cake, but you need to have a special recipe book that tells you how much sugar, flour, and eggs to use. Eudralex is like that recipe book, but for medicine.
It is important to have this book because medicine is very important and it can help people get better. But we need to make sure that the medicine is safe and works well before we give it to people. That's why the book tells us how to test the medicine to make sure it is safe and how to make sure it will work.
The book also tells people who want to make and sell medicine how to get permission and follow the rules. Just like we need to follow rules when we play games, people who make medicine need to follow rules too. This helps make sure that the medicine we take is safe and helps us get better without making us sick.
In summary, Eudralex is a big book that tells us how to make, test, and sell medicine safely so we can all stay healthy.