Visa types granted by the United States of America are;

• United States of America Emergency Visa (on Holidays/Weekends)
• United States of America Visa for Diplomatic/official/ Laissez-Passers Passport Holder
• United States of America Visa for individuals working in designated US Agencies or technology areas
• United States of America Tourist Visa
• United States of America Business Visa
• United States of America Employment Visa
• United States of America Transit Visa
• United States of America Medical Visa
• United States of America Student Visa (Study/Research/Internship)
• United States of America Entry Visa
• United States of America Conference Visa
• United States of America Mountaineering Visa
• United States of America Missionary Visa
• United States of America Journalist Visa(Journalist/Documentary filming)
• United States of America Film Visa: Visa for shooting Feature Films

Here are some ESTA articles that might help you.

• ESTA Application for Traveling to USA
• ESTA Visa Guide
• US Passport / Visa Photo Requirements
• List of Eligible Countries for ESTA Visa
• ESTA Documents Requirement