Green card visa

-----------------------------Green card visa-----------------------------------------
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). That agency has been absorbed into and replaced by the Bureau of Citizenship and Immigration Services (BCIS), part of the Department of Homeland Security (DHS). Shortly after re-organization BCIS was renamed to U.S. Citizenship and Immigration Services (USCIS).
An alien with a green card application can obtain two important permits while the case is pending. The first is a temporary work permit known as the Employment Authorization Document (EAD), which allows the alien to take employment in the United States. The second is a temporary travel document, advance parole, which allows the alien to re-enter the United States. Both permits confer benefits that are independent of any existing status granted to the alien. For example, the alien might already have permission to work in the United States under an H1-B visa.