1. Nonimmigrant Visas (Temporary Stay)

Tourism & Business

• B-1: Business visitors
• B-2: Tourism and medical treatment
• ESTA (Visa Waiver Program): For citizens of specific countries (90 days max)

Work Visas

• H-1B: Specialty occupations (requires a degree)
• H-2A: Temporary agricultural workers
• H-2B: Temporary non-agricultural workers
• H-3: Trainees or special education exchange visitors
• L-1A / L-1B: Intra-company transferees
• O-1: Individuals with extraordinary ability (science, arts, education, etc.)
• P-1 / P-2 / P-3: Athletes, entertainers, and artists
• TN: NAFTA professionals (Canada and Mexico)

Student & Exchange Visas

• F-1: Academic students
• M-1: Vocational students
• J-1: Exchange visitors (includes au pairs, scholars, interns)

Other Nonimmigrant Visas

• K-1: Fiancé(e) of U.S. citizen
• U: Victims of criminal activity
• T: Victims of human trafficking
• R-1: Religious workers

2. Immigrant Visas (Permanent Residency / Green Card)

Family-Based

• IR1 / CR1: Spouse of U.S. citizen
• IR2 / CR2: Child of U.S. citizen
• F1 – F4: Family-sponsored preferences

Employment-Based

• EB-1 to EB-5: Categories for workers, investors, and individuals with extraordinary abilities

Special Immigrants

• SI / SQ: Certain Iraqis/Afghans who worked with the U.S. government
• Other: Special religious workers, broadcasters, etc.