For short-term visits to the United States (for tourism, business, education, and more), you can go directly to the online application (form DS-160). The letter should include specific details like your relationship with the visitor, the purpose of their visit, duration of stay, and financial arrangements.An invitation letter for the sake of a B2 visa is not required. No invitations, no sponsorships - in fact no documentation is required. What should the letter say? To obtain a visa invitation letter for Display Week 2025, please fill out the form below. The visa invitation letter is free, but email form only. For business travelers, a letter from a foreign employer explaining the purpose of the business trip and the duties involved during the stay in the U.S.. If you require an invitation letter as part of your Visa application, please fill out and submit the form on this page. This is not a registration page.