OBS_VALUE: The following documents are required a for nonimmigrant visa for business travellers (B-1): 1. Passport; 2. Nonimmigrant Visa Application, Form DS-160 confirmation page; 3. Application fee payment receipt; 4. Photo. Additional documentation may be required. For example, additional requested documents may include evidence of: 1. The purpose of your trip; 2. Your intent to depart the United States after your trip; and/or 3. Your ability to pay all costs of your trip.See also: https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/forms/ds-160-online-nonimmigrant-visa-application/ds-160-faqs.html