A USA visa is a document required for an individual that is not a citizen of the United States, but who wishes to gain temporary or more permanent residency. There are two types of USA visas, an immigrant and nonimmigrant visa. A nonimmigrant visa is for a more temporary visit such as a trip for business, pleasure, or studies abroad. An immigrant visa is for those who ultimately wish to be permanent residents within the United States with a more lenient time limitation. A USA visa may be issued for work or school and is the first step towards gaining residency and citizenship for anybody coming from outside of the country.