M-1 visas are issued to students enrolling in vocational or nonacademic programs in the United States, while M-2 and M-3 visas are for their dependents. Applicants must provide a Form I-20, demonstrate sufficient funds, and prove non-immigrant intent. The length of stay is limited to the duration of the program, up to one year, with extensions being limited. The visa fee is $185, and the SEVIS fee is $350. The process is of moderate difficulty, visa agency involvement is helpful,  and processing times are typically several weeks. The approval rate ranges from 70% to 75%.