B visas are for persons who wish to visit the United States for business, pleasure, or medical treatment. Business visitors are issued B1 visas, and visitors coming to the United States for pleasure or medical treatment are issued B2 visas. B visa holders are not allowed to work or study in the United States.
To qualify for a B visa, you must show:
Business visitors must show that they seek to enter the United States to engage in commercial or professional activity. Examples of such activity include negotiating contracts; consulting with business associates; conducting business or marker research; interviewing and hiring staff; litigation; and participating in scientific, educational, professional, or business conventions.
All work done in the United States pursuant to a business visa must be for your employer outside the United States, and you must continue to be paid by your employer outside the United States. You cannot be employed by a U.S. company while on a B1 visa.
A B2 visa is the visa to apply for if you are coming to the United States for one or more of the following purposes:
The application for a B1/B2 visa must be submitted at a U.S. embassy or consulate abroad. The visa forms you need to file will depend on which U.S. embassy or consulate you are applying through.
Generally if you are apply for a B1/B2 visa, you will need to submit evidence of:
If you are applying for a B1 business visitor visa, you will need to submit additional documents providing details about your trip and planned activities in the United States.
If you are applying for a B2 visitor visa so you can receive medical treatment in the United States, you should submit:
USCIS - B-1 Temporary Business Visitor
U.S. Embassies and Consulates Abroad
U.S. Customs and Border Protection - For International Visitors
U.S. Customs and Border Protection - Immigration Inspection Program
U.S. Dept. of State - Business Visa Center
U.S. Dept. of State - Business and Pleasure Visitor Visas
U.S. Dept. of State - Business Travel to the U.S. (PDF)
TRAC Immigration - Immigration Inspections When Arriving in the U.S.