The most commonly used non-immigrant visas for the United States are: 1. **B-1/B-2 Visitor Visa** - For individuals visiting the U.S. temporarily for business (B-1) or tourism (B-2). 2. **F-1 Student Visa** - For students pursuing academic studies at an accredited institution in the U.S. 3. **H-1B Work Visa** - For skilled workers in specialty occupations, typically requiring a bachelor’s degree or higher. 4. **L-1 Intracompany Transferee Visa** - For employees of multinational companies being transferred to a U.S. office. 5. **J-1 Exchange Visitor Visa** - For individuals participating in exchange programs, including scholars, students, and professionals. 6. **O-1 Visa** - For individuals with extraordinary ability or achievement in fields like arts, sciences, education, or business. These are the most common types, but the exact visa depends on the individual's purpose for traveling to the U.S.