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A visa is an official document, often a stamp or sticker in a passport, that grants a foreign national permission to enter and stay in a country for a specific purpose and duration. It signifies a government's approval for activities like tourism, study, or work. Visas differ from passports, which identify a person as a citizen of a country and entitle them to protection abroad.

There are various types of visas, including those for business, study, medical treatment, and tourism. Nonimmigrant visas allow temporary stays, while permanent or resident visas, like the U.S. "green card," permit long-term residency and employment. The H-1B visa, for example, is a temporary U.S. visa for individuals in specialized occupations requiring at least a bachelor's degree.1

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