B-2 Visa for Leisure or Tourism:
Foreign nationals who wish to visit the United States for leisure or tourism are normally eligible to receive B-2 visas. B-2 tourist visas are required for citizens of countries that are not included in the Visa Waiver Program. However, citizens of countries included in the Visa Waiver Program may also be required to obtain a B-2 visa if they plan to stay in the United States for longer than 90 days or change status to other immigration categories after entering the country. Persons admitted to the United States under a B-2 visa are not allowed to work or receive any kind of payment while staying in the United States.
B-2 visas are also issued to individuals who are coming to the United States to undergo medical treatment. The application process is similar to that of a visitor for leisure, but there are additional documents that must be submitted to establish that the applicant qualifies for the visa. The list of required documents and the application process is described in the B-2 tourist visa information and application kit.