Some types of U.S. visas include visas for employment, athletes, spouses of United States citizens and inter-country adoption of foreign orphans, explains the United States Department of State. Another visa type is for fiancées marrying United States citizens to live in the United States.
There are two different categories for United States visas: A nonimmigrant visa and an immigrant visa. A nonimmigrant visa is for individuals who have no intention of living in the United States. An immigrant visa is for individuals who plan on living permanently in the United States, explains the Department of State.
The purpose of a person's intended travel to the United States, as well as other circumstances surrounding his visit determines the type of visa he is required to receive. Visa applicants need to meet all of the necessary requirements in order to receive the visa in the category in which he is applying, says the Department of State.
Having a U.S. visa allows a person to travel to a port of entry, land border crossing or airport and request permission from the Customs and Border Protection or Department of Homeland Security to let the individual into the United States. Having a visa does not guarantee entry, but it does indicate a consular officer has deemed the individual eligible to seek entry for the specific purpose he's seeking entry for, the Department of State reports.