An F-1 visa is a non-immigrant student visa that allows international students to study in the United States at accredited institutions. This visa is specifically for full-time students enrolled in academic programs, language training programs, or other approved courses. To maintain F-1 visa status, students must attend classes regularly and make satisfactory academic progress. They may also work on-campus and, under certain conditions, apply for off-campus employment through programs like Optional Practical Training (OPT) or Curricular Practical Training (CPT).