What is "green card"? Is there any other colored card as well?
A "green card" is a permanent resident card in the United States. In the United States, a "green card" allows a foreign citizen to live and work permanently. A "green card" does not grant U.S. Citizenship, however, it allows someone to be very close to a citizen. The only reason it is known as a "green card" is because that was originally the color of the cards. There are not really any other colored cards that are used commonly.
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