Well, kiddo, the number 112 is a telephone number you can call in case there is an emergency. An emergency is when there is danger or someone needs help right away, like if there is a big fire, someone is hurt or sick, or somebody is trying to hurt you or someone else.
When you call 112, someone will answer the phone and ask you what's wrong. They will need to know where you are and what the emergency is. It's really important to give them clear and accurate information, so they can send help right away.
The people who answer the phone are called emergency dispatchers. They work in special places called call centers and they are trained to stay calm and help you in the best way possible.
It's important to remember that 112 is only for emergencies. So, if you just need to ask a question or talk to someone, you need to call another number. In most countries, you can also call 911 for emergencies.
So, remember, in case of emergency, call 112 to get the help you need.