A "Green Card Holder" is a person who has been granted permanent residency in the United States. This status allows them to live and work in the country indefinitely. Green Card holders receive a document known as a Green Card, which serves as proof of their legal status. To become a Green Card holder, individuals typically go through a process that may involve family sponsorship, employment opportunities, or refugee status. Once they hold a Green Card, they can apply for U.S. citizenship after meeting certain requirements, such as residing in the country for a specific number of years.