Okay kiddo, so let me explain what "non-refoulement" means in a way that you can understand.
Non-refoulement is a big word that basically means that a person cannot be sent back to a country where their safety or human rights might be in danger.
Let me give you an example. Imagine you have a friend who lives in a country where there is a war going on. They are very scared and want to come live with you in your country where it is safe. But the government in your country says, "No, sorry, we won't let you in." That is called refoulement, and it's not fair because your friend needs a safe place to live.
Now, thankfully, most countries have agreed that they won't do this kind of thing anymore. They have said that if someone comes to their country and says they need help, they will listen and try to help them. They won't just send them back to a dangerous place. This is called non-refoulement, and it is an important part of protecting human rights. So, it's like a big rule that says no one should be harmed if they seek help in a new country.