Two groups of family-based immigrant visa categories, including immediate relatives and family preference categories, are provided under the provisions of United States immigration law, specifically the Immigration and Nationality Act (INA).
A visa can permit you to remain in the US for some time and can even pave the way to applying for a green card. However, with a visa, your permanent residence is still outside the US. With a green card, however, you become a permanent resident of the US. You can stay and work in the US indefinitely.
Humanitarian visas also are known as humanitarian parole and are granted for urgent humanitarian reasons. People who receive humanitarian parole are those who otherwise are unable to enter the U.S. but must do so on a temporary basis and for a compelling emergency.
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