The U.S. issues two types of visas: non-immigrant visas and immigrant visas. A non-immigrant visa is for the purpose of travel to the U.S., and is intended for individuals such as: business visitors, athletes, exchange visitors, intra-company transfers, entertainers, professors, students, temporary agricultural workers, tourists, and others.
An immigrant visa is intended for those coming to the United States to live here permanently. These are intended for certain family members of U.S. Citizens or Green Card holders, also for fiances of U.S. Citizens. Immigrant visas are also issued for certain priority workers.