Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for temporary stay or an immigrant visa for permanent residence. The visitor visa is a nonimmigrant visa for persons desiring to enter the United States temporarily for business (B-1) or for pleasure or medical treatment (B-2). Persons planning to travel to the U.S. for a different purpose, such as students, temporary workers, crewmen, journalists, etc, must apply for a different visa in the appropriate category. Some of those include F-1 Student, J-1 Exchange Visitors and M-1 Vocational Student. Travelers from certain eligible countries may also be able to visit the U.S. without a visa, through the Visa Waiver Program. Read more about how to participate in the Visa Waiver Program on the U.S. Customs and Border Protection (CBP) website. More helpful information on the Visa Waiver program is found on the State Department Visa Services website.