Okay kiddo, have you ever seen a fireman put out a fire? Well, a fire protection engineer helps make sure that if there is a fire, it does not spread and cause more damage.
They design things like sprinkler systems, alarms, and fire escapes. They also make sure buildings are built with the right materials that can resist fire, and that there are enough exits for people to leave safely.
A fire protection engineer thinks about what could happen if there is a fire and they make a plan to prevent it from happening or to make sure everyone stays safe if it does happen. It's like playing pretend firefighter, but with a lot more math and science!