What is commonly referred to as a "green card" in the context of U.S. immigration?

A "green card" is commonly referred to as a Permanent Resident Card. This card signifies that an individual has been granted the right to live and work permanently in the United States. It is an essential document for foreign nationals who wish to reside in the U.S. indefinitely, as it provides various rights and privileges, including the ability to apply for a Social Security number and the opportunity to eventually apply for U.S. citizenship after meeting certain residency requirements.

The Permanent Resident Card is called a "green card" because of its historical green color, which distinguishes it from other forms of immigration documentation. This card must be renewed periodically, but it is distinct from certain temporary visas or documents that confer limited rights or durations of stay.

Other options refer to different immigration statuses or documents. A temporary visa allows for a limited stay in the U.S. for specific purposes, such as tourism or study. An Employment Authorization Document permits individuals to work in the U.S. for a specific period but does not grant permanent residency. A visitor visa, on the other hand, is intended for short-term visits and does not allow for permanent residence. Thus, the Permanent Resident Card is the correct designation for what is known as a "green card."