The U.S. visa system is divided into immigrant visas (leading to permanent residency) and nonimmigrant visas (for temporary stays). Each category has specific requirements and limitations.
Nonimmigrant Visas (Temporary)
Common nonimmigrant visa categories include:
B-1/B-2 — business visitors and tourists
F-1 — international students at academic institutions
H-1B — specialty occupation workers (requires a bachelor's degree or equivalent); subject to an annual cap
H-2A / H-2B — temporary agricultural and non-agricultural workers
J-1 — exchange visitors (scholars, interns, au pairs)
O-1 — individuals with extraordinary ability in sciences, arts, education, business, or athletics
TN — professionals from Canada and Mexico under the USMCA (formerly NAFTA)
Immigrant Visas (Permanent)
Immigrant visas lead to lawful permanent residency (green card). Major categories include:
Family-based — sponsored by a U.S. citizen or LPR family member
Employment-based — sponsored by an employer in five preference categories (EB-1 through EB-5)
Diversity Visa Lottery — 50,000 visas per year for underrepresented countries
Special immigrant — religious workers, certain international organization employees, and others
Visa Application Process
For most nonimmigrant visas:
1. Complete the DS-160 application online
2. Pay the application fee
3. Schedule an interview at a U.S. embassy or consulate
4. Attend the interview with required documentation
5. Receive a visa decision
For immigrant visas, the process typically involves a petition filed by a sponsor, followed by either consular processing abroad or adjustment of status within the U.S.
Visa Limitations
Annual numerical caps apply to many visa categories
Some categories have per-country limits, creating long backlogs (especially for applicants from India, China, Mexico, and the Philippines)
Maintaining valid visa status is critical — overstaying can result in bars on future admission