Legal Definition of Permanent Resident Card: United States permanent residents have an identification card known as the “Permanent Resident Card.” The Permanent Resident Card is also known as are the immigrant visa, permanent visa, Green Card, permanent resident visa, and form I-551 or form I-551. While permanent residents are not United States citizens, they are granted permission to reside and work in the United States on a permanent basis. Before the terrorist attacks of September 11 2001, the requirement to carry the Permanent Resident Card at all times was not strictly enforced. Previously, permanent resident cards were usually only checked when traveling outside the United States. However, now the U.S. Department of Homeland Security (DHS) requires that permanent residents of the United States be prepared to show their Permanent Resident Card at all times. DHS also requires that all permanent residents of the United States who are traveling to show their Permanent Resident Card or other documentation that will prove their legal status in the country.

The current Permanent Resident Card or permanent residency card is predominantly white with black letters. The Permanent Resident Card includes the bearer's name and photograph as well as other identifying information. It is the size of a credit card and is plastic. When looking at the back of the current permanent residency card, the green is more prominent. Throughout the years, it continues to be updated with new anti-counterfeit features. Regardless of the color of the actual card, it will be known as the “Permanent Resident Card” because the first card that differentiated lawful permanent residents was green and it is a term that has remained. Being a permanent resident in the United States entitles individuals to certain rights and those rights came into existence when the permanent residency card was green. However, there are instances when the Permanent Resident Card can be revoked. These instances include an individual being outside the United States for an extensive period of time, not maintaining permanent residence in the United States, or breaking certain laws.