ramin Ray delavari immigration Service Pre-Medical Business travelers may enter the United States using a B1, or 'Visitor for Business' Visa. In practice these visas are invariably issued as jointly with B2, or 'Visitor for Pleasure' (i.e. Tourist) visa. People who wish to come to USA for any Business such as attending seminar, business purpose, company sponsored training and etc. could apply for B1 Visa. These applicants required a letter from the employer in which the purpose and duration of travel should be mentioned and he/she should show that the costs will be paid by company.