International students applying to US institutions have additional documentation to present, such as visa eligibility, English proficiency, and financial capabilities.
A visa is a permission to apply for entry to the USA. It consists of a sticker, which has photo of the applicant and biographical data.
Visa Classification for Students (Source: US Department of State)
F -> Granted to student in an academic or language program
J -> Granted to exchange Visitor – Secondary school student, college/university
Student; Degree student or Non-degree Student
M -> Granted to vocational Student or other nonacademic student.