It's like having a group of really cool friends who are trained to help people when they get sick or hurt.
They have a special vehicle called an ambulance that they use to get to the sick or hurt person quickly. The ambulance has lots of things in it like medical equipment and medicine to help the person feel better.
When they get to the sick or hurt person, they will ask them questions about how they are feeling and check their body to see if anything is wrong. They will use their special equipment to help the person breathe or stop bleeding if they need to.
Once they have helped the sick or hurt person as much as they can, they will take them back to the hospital so that doctors can keep taking care of them.
It's really important to have friends who are trained to help people when they get hurt or sick, so if you ever need help, they can be there for you.