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.