A U.S. visa is a travel document that allows you to enter the U.S. Visas are issued for specific purposes of travel, such as tourism, business, study, employment or to join family.
Your VISA is determined on the basis of your reason for traveling to the U.S.
Visas are also issued for a specific period of time - once a
visa expires, you no longer have the legal right to travel to or remain
in the U.S.
There are two types of U.S. visas, nonimmigrant and immigrant. What is the difference between the two? Mostly, the length of time they allow you to stay in
Nonimmigrant Visas are issued for temporary stay in the U.S. They are designated for people who live outside the U.S. but who wish to visit the country for different reasons like tourism, business, studying or working (periods between three months and two years).
Immigrant Visas are issued for permanent stay in the U.S. An immigrant visa allows you to travel to the U.S. and once you enter, to legally establish your residence. This means you will officially and permanently become a U.S. permanent resident and receive a lawful permanent resident card (green card). There are three categories of immigrant visas: family-sponsored, employment-based and special immigrant.