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A visa is a document that governs the entry and exit of an individual through the borders of a country. The United States issues a wide variety of nonimmigrant and immigrant visas which are governed by the Immigration laws of the country. Changes in U.S. laws that govern visa policies in the years after the terrorist attacks of 9/11 now affect the amount of time it takes to issue a U.S. visa.

However, a visa doesn’t necessarily permit entry into the U.S. as it only indicates that the visa application made by a foreign national has been reviewed by a consular officer at a U.S. consulate or embassy abroad and that officer has deemed the foreign national as eligible for travel to the U.S. for the specific purpose for which the application was made. This visa must then be presented to the immigration officer of the Department of Homeland Security at a U.S. po…