Rehabilitation is when someone who has done something wrong learns how to stop doing that wrong thing and becomes a better person. It's like when you're learning to ride a bike, you might fall off a few times, but you keep practicing until you can ride safely.
For some people, rehabilitation means going to a special school or class where they learn new skills or behaviors. For example, they might learn better ways to handle their feelings or how to make good choices instead of bad ones.
Other people might need to see a doctor or therapist to help them with problems like anger or sadness. They might learn how to talk about their feelings and find ways to feel better without hurting themselves or others.
Rehabilitation is important because it helps people who have done bad things to become better people and make better choices in the future.