Hukou
Hukou is a system of household registration used in mainland China. It officially identifies a person as a permanent resident of a place.  It has information about name, parents, spouse and date of birth. A hukou can also refer to a family register. The household register is for a family, and usually includes the births, deaths, marriages, divorces, and moves, of all the people in the family. A person's residence is tied to their place of birth or their parent's place of birth. Hukou registration limits the types of jobs a person can do in a city and the types of housing they are able to stay in.