A United States Permanent Resident Card. Actually pink, this identification card allows an immigrant to reside and live permanently in the United States. Green-card holders are also able to work in the U.S., to travel and to receive some government benefits. A green-card holder is not a U.S. citizen but can live in the United States permanently.
It can be insulting to ask Latinos born in the United States and Puerto Ricans whether they have a green card, as they are U.S. citizens by birth.