U.S. VISA PROCESS - HELPFUL INFORMATION
Official U.S. Department of State information about U.S. Visa Policy and Procedures is available on the following sites. Use these sites to learn about the visa application process, understand current requirements, and get updates on recent developments.
- U.S. Department of State - Visas
- U.S Embassies and Consulates abroad
You do not need visa invitation letters to apply for a visitor visa. Instead, you need to document the reason/purpose of your visit. The conference/workshop website contains this information, including event name and dates. The United States Department of State is the definitive source of visa requirements for your visit. Its website is travel.state.gov/content/travel/en/us-visas/tourism-visit/visitor.html.