VISAS Overview
There are limited ways by which a person can seek admission to the U.S. An individual coming legally to the U.S. must have been prescreened by a consular officer and got a travel permit called a visa.
A visa is a passport stamp issued by a consulate that permits the holder to apply to the immigration inspector at an airport or border crossing to be admitted into the U.S. A visa does not guarantee admission to the U.S.
Form I-94 is given to non-immigrants by an airline flight attendant or by a CBP officer at the port of entry. Form I-94 is a small white or green card. The CBP officer will write the date of admission, the visa classification, and the period of authorized stay on the I-94 before stapling it into the passport.
Foreign nationals should be reminded to check their I-94s before leaving the immigration station to ensure they are given the proper qualification and appropriate length of stay.
Visas are usually issued for three types of entrants:
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Refugees who have the intention of remaining in the United States permanently;
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Immigrants who also want to remain permanently in the U.S.;
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Non-immigrants who seek admission in the U.S. for a temporary purpose;