There is a wide range of nonimmigrant visa categories, each serving a different purpose:

A - Diplomatic employees and their households
B - Business visitors (B-1) and Visitors for Pleasure (B-2)
C - Transit visa
D - Crew member
E - Treaty Visa (E-1 Treaty Trader) (E-2 Treaty Investor)
F - Students
G - Employees of International Organizations
H - Temporary Workers (minimum of a university degree required)
I - Representatives of international media
J - Exchange visitors
K - Fiancés
L - Intracompany transferees
M - Language and vocational students
N - NATO employees
O - Extraordinary ability aliens
P - Athletes, entertainment groups
Q - Cultural exchange visitors
R - Religious workers
S - Criminal informants