Okay, kiddo, so 9-1-1 is a special phone number that people can call when they need help in an emergency. Do you know what an emergency is? It's when something really bad is happening and we need grown-ups to come help us right away.
When someone calls 9-1-1, it goes to a special place called a 9-1-1 call center. This is a place where people who are specially trained to help in emergencies answer the phone. They will ask the person calling questions to find out what kind of emergency it is and where it's happening.
Once they know that, they will send the right kind of helpers to the place where the emergency is happening. This could be an ambulance if someone is hurt or sick, firefighters if there's a fire, or police officers if someone is in danger.
It's really important that people only call 9-1-1 in a real emergency. That means if someone is hurt, there's a fire, or someone is in danger. If someone calls 9-1-1 for something that's not an emergency, it can take away precious time and resources from people who really need help.
So, always remember that if you need help in an emergency, you can call 9-1-1 and grown-ups who know how to help will come to you as fast as they can!