Conditional dismissal means that you can make a deal with the grown-ups in charge to make something that you did wrong go away. It's like when you eat all your vegetables and your parents say you don't have to clean your room tonight. The deal is that you have to do something good in exchange for something bad that you did.
In the same way, when adults bring charges against you for doing something wrong, like breaking a rule or law, you can make a deal with them called a conditional dismissal. This means that you agree to do something to make up for what you did wrong, and in exchange, the charges against you will be dropped.
For example, if you get in trouble for stealing a candy bar from a store, you might be offered conditional dismissal if you agree to do community service or apologize to the store owner. This means that if you complete the community service or apologize, the charges will go away and you won't be in trouble anymore.
Conditional dismissal is a good thing because it gives you a chance to make up for what you did wrong and learn from your mistakes without having a permanent mark on your record. However, it's important to remember that a conditional dismissal is a serious agreement, and if you don't follow through with what you promised, the charges could come back and you could be in even more trouble.