You may be eligible to apply for a Green Card (Permanent Resident Card) through your family, a job offer or employment, refugee or asylum status, or a number of other special provisions. In some cases, you may even be able to self-petition or have a record created for permanent residence on your behalf.
Naturalization is the manner in which a person not born in the United States voluntarily becomes a U.S. citizen.
If you were born outside of the United States, there are two general ways to obtain U.S. citizenship through U.S. citizen parents. You can acquire U.S. citizenship at birth (acquisition) or you can derive citizenship from your parents after your birth but before the age of 18 (derivation).
A Permanent Resident Card (USCIS Form I-551) is proof of your permanent resident status in the United States. It also serves as a valid identification document and proof that you are eligible to live and work in the United States.