What is a Visa?
An official mark or stamp in a passport that allows someone to enter a country for a particular amount of time. Common visa types for international students and scholars in the United States include the F-1 (student visa) and J-1 (exchange visitor visa). To apply for a U.S. visa, student applicants must first receive a Form I-20 from the college or university they plan to attend, which is created by the U.S. government's SEVIS database.
Answer obtained from: https://www.usnews.com/educ... 
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