Non-immigrant Visas

-H Visa
Persons going to the United States with the intention of working there temporarily in specific prearranged employment, require a classification H visa. The employment must be approved in advance by the Department of Homeland Security, United States Citizenship and Immigration Services (USCIS) in the United States on the basis of a petition, form I-129 filed by the United States employer. The H category can also include training.

There are several classifications of H visas, including H-1B (specialty occupation), H-2A and H-2B (temporary or seasonal agricultural and nonagricultural workers) and H-3 (trainee).