There are dozens of different types of visas available under the provisions of the Immigration and Nationality Act (INA), but they can all be placed in one of two categories: immigrant and nonimmigrant visas. The former is for individuals who are hoping to establish permanent residency with a green card and perhaps even to pursue the path to naturalization and citizenship. The second is for those who are only planning a temporary visit to the United States, such as for the purpose of conducting business or attending school.