A home return permit is like a special ticket that you need to have if you want to go back to your home country after you have gone to another country to live or work. It's a piece of paper that shows that you have permission to come back home. This permit is usually required by people who leave China, and then want to come back again after they have been away for a while.
The home return permit has important information on it, like your name, where you come from, and how long the permit is valid for. It's a bit like a passport, but only for going home. It's really important to have this permit because otherwise, you might not be allowed to come back to your home country.
To get a home return permit, you have to go to the government office in charge of issuing them. There, they will ask you some questions, check your documents, and make sure everything is okay before they give you the permit. Once you have the permit, you can travel back home whenever you want, but only within the time limit on the permit.
So, to sum up, a home return permit is like a special ticket that you need to have if you want to go back to your home country after leaving it for a while. It's really important to have one, and you have to go to a special office to get it.