When you become a grown-up and you want to become a nurse, you have to go to school to learn how to do it. When you are done with school, you will have something called a nursing license. This is like a secret code that says you can be a nurse and help people feel better.
Sometimes, nurses want to learn even more things so they can help people better. They go to extra classes and take special tests to get something called a nursing certification. It's like an extra stamp of approval that says they are really good at working with certain types of people or helping with certain medical problems.
For example, some nurses might get a certification in helping babies who are born early or sick. Others might get certified in taking care of people who have heart problems.
So when you go to the doctor or the hospital, the nurse who comes to help you might have special stickers on their badge that show they have these certifications. This can help you trust that they know how to take care of you really well!