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"Green card" nickname (because of the color) of the United States Permanent Resident Card, an identification document issued by the United States of America affording non-citizens of that country some of the rights its citizens enjoy, sometimes with the prospect of naturalization.

A United States Permanent Resident Card, also known as a green card, is an identification card attesting to the permanent resident status of an alien in the United States of America. Green card also refers to an immigration process of becoming a permanent resident. The green card serves as proof that its holder, a Lawful Permanent Resident (LPR), has been officially granted immigration benefits, which include permission to reside and take employment in the USA. The holder must maintain permanent resident status, and can be removed from the US if certain conditions of this status are not met.

Green cards were formerly issued by the Immigration and Naturalization Service (INS