Citizens of the U.S. Visa Waiver Program countries are permitted to enter the U.S.A. for general business or tourist purposes for a maximum of 90 days without needing a visa.

The twenty-seven Visa Waiver countries are Andorra, Australia, Austria, Belgium, Brunei, Denmark, Finland, France, Germany, Iceland, Ireland, Italy, Japan, Liechtenstein, Luxembourg, Monaco, Netherlands, New Zealand, Norway, Portugal, San Marino, Singapore, Slovenia, Spain, Sweden, Switzerland, and United Kingdom.

Citizens from these countries do not need to obtain a visa prior to their travel to the U.S.A.. To qualify for the Visa Waiver Program, travelers from these countries also need to comply with the following statements:

Length of stay in the U.S. must not exceed 90 days Must hold a ticket, e-ticket or proof of the return portion and/or next destination Fill out an I-94W form (also known as green I-94) to present to the agents upon arrival in U.S. territory (first point of entry) Must participate in the U.S.-VISIT program.

To obtain more information, please check the links below:
U.S. Department of Homeland Security
U.S. Department of State
TIA - Travel IndU.S.try Association of America