Visa Waiver Program
The Visa Waiver Program (VWP) enables most citizens or nationals of participating countries to travel to the United States for tourism or business for stays of 90 days or less without obtaining a visa. Travelers must meet all VWP requirements, to include having a valid Electronic System for Travel Authorization (ESTA) approval prior to travel. If you prefer to have a visa in your passport, you may still apply for a visitor (B) visa.
Please visit the above links, or the Department of State’s Visa Waiver Program website, for additional information.