The Consulates of the United States of America, located in most countries around the world, are in charge of receiving, processing and authorizing the granting of "Non-Immigrant" (B1-b2, L1, H1, etc.) or "Immigrant" visas (Residences) to citizens of other nationalities so that they can enter U.S. territory through its various points of migration inspection, at airports, seaports or land borders.

The regulations of the United States, Department of Homeland Security-DHS- requires most foreign students to attend aviation-flight-training programs on M-1 student visas.

An American visa is the most valuable key that a foreign citizen has for entering the United States and be able:to do business make investments, do banking transactions, or to travel freely and legally within the U.S. territory, to study, work, to take an aeronautical course, make legal arrangements of all types, or to simply enjoy a vacation, sightseeing and entertaining oneself, among many other benefits.

The United States is, perhaps, one of the only countries in the world that receives more than 9 million visa applications annually, from citizens of all nationalities, who wish to do business, live, work, study or simply visit the country.