When someone gets arrested by the police, they have to be told a special message called the "Miranda warning". This is a set of words that remind you that you have the right to stay silent and not say anything that can be used against you in court. It also tells you that you have the right to talk to a lawyer and have them help you out.
It's like going to the doctor's office and they tell you what's going to happen during your appointment. The Miranda warning is a warning about what's going to happen if you get arrested by the police. It's important to listen carefully to this warning because it tells you what you can and cannot do.
If you get arrested and the police didn't tell you the Miranda warning, then what you say to them in response may not be admissible in court. That means it can't be used as evidence against you because you weren't properly informed of your rights.
So, the Miranda warning is important because it reminds people that everyone has rights, no matter what the situation is.