So, imagine you have a very important letter that you need to give to someone far away. But you don't want just anybody to see it because it's a secret. What do you do?
Well, if you're a really important person like a government official, you might have a diplomatic courier. A diplomatic courier is a fancy way of saying a person who delivers important letters and documents to other important people without anyone else being able to see them.
It's like playing a game of hot potato, except the potato is the important letter and the people passing it around are your helpers who will make sure it gets to the right person.
The diplomatic courier will carry the letter in a special bag or package called a diplomatic pouch. This pouch is sealed and can only be opened by certain people. It's like having a special lock on your diary that only you and your best friend can open.
So, when the diplomatic courier travels, they have a very important job to make sure the letter gets to the right person safely without anyone else seeing it. It's like being a secret agent or a spy. Pretty cool, huh?