Nonimmigrant visas are required of foreign nationals seeking to enter the United States on a temporary basis. The type of nonimmigrant visa needed is defined by immigration law, and related to the purpose of the travel. The main categories are given letter designations. They are: A, career diplomats; B, temporary visitors for business and pleasure; C, foreigners in transit; D, crewmembers; E, treaty traders and investors; F, students; G, employees of designated international organizations; H, temporary workers; I, foreign journalists; M, vocational students; N parents and children of aliens accorded special immigrant status; O, aliens with extraordinary abilities; P, performing athletes, artists, entertainers; Q, cultural exchange program participants; R, religious workers; and TN/TD, for NAFTA professionals.
Definition from Nolo’s Plain-English Law Dictionary
A U.S. visa, issued by a U.S. consulate or embassy, that allows its holder to come to the United States temporarily and for a limited purpose. Each nonimmigrant visa comes with a different set of privileges, such as the right to work or study. In addition to a descriptive name, a letter of the alphabet and a number identifies each type of nonimmigrant visa. Student visas, for example, are F-1 or M-1, and investor visas are E-2. Nonimmigrant visas also vary according to how long they permit the holder to stay in the United States. For example, someone on an investor visa can remain for many years, but someone on a visitor's visa can stay for only six months at a time.
Definition provided by Nolo’s Plain-English Law Dictionary.
August 19, 2010, 5:20 pm