At UNH the most commonly seen non-immigrant visas are the F-1 Student Visa, the J-1 Exchange Visitor, the H-1B Temporary Worker, the TN for citizens of Canada or Mexico and the B-1 or B-2 for short-term visitors.
Non-immigrant visas are issued to foreign nationals who intend to remain in the U.S. for a temporary period of time. There are more than 40 non-immigrant U.S. visas; each visa type is used to enter the U.S. for a different purpose. Some visas authorize a period of temporary employment in the U.S., others permit foreign students to study, provide opportunities for international, educational exchange and allow foreign diplomats to serve their country's interests. The majority of foreign nationals enter the U.S. as tourists or for short-term business needs, rather than to "immigrate".