The different temporary Non-Immigrant Visa/Status categories are:

A: Diplomatic employees and their households.

B: Business visitors (B-1) or tourists (B-2).

C: Aliens in transit (pass-through at an airport or seaport).

D: Crewmember (air or sea).

E: Treaty investors or treaty traders.

F: Students.

G: Employees of international organizations.

H: Temporary workers. Can be professionals (H-1B), nurses (H-1C), agricultural workers (H-2A), temporary or seasonal workers (H-2B), or trainees (H-3).

I: Representatives of international media.

J: Exchange visitors (educational exchange students, au pairs, graduate medical trainees, practical training students, professors and researchers, short-term scholars, camp counselors).

K: Fiancés and fiancées; spouses of U.S. citizens married abroad.

L: Intra-company transferees (executives, managers, persons with proprietary knowledge).

M: Language and vocational students.

N: NATO employees.

O: Extraordinary ability aliens.

P: Athletes, entertainment groups (such as orchestras) and support personnel.

Q: Cultural exchange visitors.

R: Religious workers.

S: Criminal informants.

T: Victims of a severe form of trafficking in persons.

TN: NAFTA professionals.

U: Victims of criminal activity.

V: Spouses and minor children of permanent residents who are waiting for green cards.