Imagine if you sent a letter to someone, and you wanted to make sure that they received it. Sometimes, the person who receives a letter might not tell you that they got it. Just like when you share your chips with your friend and they don't say thank you!
So, a return receipt is like a grown-up way of saying "Hey, did you get my letter?" It's a special type of mail that you can send that asks the person who receives it to tell you if they got it. It's like when you ask your friend if they got the text you sent them.
When you send a return receipt mail, the post office puts a special sticker on the envelope that tells the person who gets it that they need to send something back to you. It's like a secret code. When the person gets your letter, they have to sign something and send it back to you to show that they got it.
So, a return receipt is a way to make sure that you know that the person you sent the letter to got it. It's like getting a receipt when you buy something at a store so you know you paid for it. Just like you need to know you got your candy bar from the store!