What do you mean by immigration, green card, nationality and permanent residency?

The term "green card" originally refers to the documents issued by the United States to permanent residents. Because the documents are green, China people are used to calling the right of abode "green card", and gradually use it to refer to the permanent right of abode of all countries.

The "permanent residence card" is an identity card used to prove that foreigners have permanent resident status in the issuing country. Synonymous with "green card", with the same meaning. The legal permanent residence of holders of permanent residence cards and green cards is an official immigration benefit granted by the state, including conditional residence in the country and permission to work. The holder must maintain his permanent resident status, and if he no longer meets certain conditions required by the status, the holder may lose his status.

"Permanent residency" refers to the right of an individual to stay permanently in a certain country with permission, but he does not necessarily enjoy civil rights. People with permanent residency are called "permanent residents".

"Naturalization" refers to the act of joining a country and swearing to become a citizen of that country. Nationality refers to the legal qualification of a person as a national of a country, and it is also the basis for the country to exercise diplomatic protection.