Okay kiddo, so in North Korea, they also have post offices just like we do. Post offices are places where you can send and receive letters and packages. But in North Korea, the postal service is owned and run by the government. That means the government is in charge of making sure your letters and packages get to where they need to go.
Whenever you want to send something in the mail, you have to bring it to a post office. There, you'll have to fill out forms and pay some money to have it sent. The post office will then take your letter or package and put it on a plane or truck to be delivered to the person you sent it to.
Now, in North Korea, things are a little bit different. For one, the country is very isolated, so mail from outside North Korea doesn't come in very often. That means that most of the letters and packages being delivered are from inside North Korea.
Another difference is that North Korea is a very secretive country, meaning they don't want people from outside the country to know too much about what's going on inside. So sometimes, the government will check the mail going in and out of the country to make sure there's nothing they don't want other people to know about.
Overall, the postal service in North Korea is just like the one we have, but there are some differences due to the country's isolation and secrecy.