What is a U.S. nonimmigrant student visa (F-1), and what conditions must students meet to maintain their status while studying?

An F-1 visa allows international students to study full-time at accredited U.S. schools. Students must maintain enrollment in a full course of study, comply with the terms of their visa, and keep valid documentation, including a Form I-20 issued by their school. Maintaining lawful status also includes updating the school and USCIS of any address changes, working only in authorized employment programs such as on-campus jobs or practical training, and avoiding activities that violate visa conditions.