The B visa category applies to citizens of foreign countries who wish to visit the United States for a temporary period.  There are two types of B visas: B-1 (for business) and B-2 (for pleasure or medical treatment).  A B-1 visa would be issued for an individual desiring to enter the U.S. to consult with business associates; attend a scientific, educational, professional or business convention or conference; settle an estate; or negotiate a contract.  A B-2 visa would be issued for an individual wishing to enter the U.S.

Student Applicants (F-1/F-2 visas) - Overview

"C" Nonimmigrant Visas - Transit Visas

The "C" visa is intended for those individuals whose travel takes them through the U.S., without intending to actually enter the U.S.

The specific visa codes are: 

The P-Visa category covers entertainers and athletes who cannot qualify under the extraordinary ability standard for the O-category. The P-1 category is set aside for:

 1.    Alien athletes who compete individually or as part of a team at an internationally recognized level; and