Foreign nationals of certain countries may enter the US without a visa, under the Visa Waiver Program (VWP). The travel can be either for business (WB) or tourism (WT), and must be 90 days or less. A machine readable passport is also required, and must be valid for at least six months past their expected stay in the US. People eligible for VWP may still apply for a visa to avoid certain limitations.
Currently there are 35 countries participating the Visa Waiver Program:
See more about visa process here
Currently there are 35 countries participating the Visa Waiver Program:
Andorra, Australia, Austria, Belgium,Brunei,Czech,Republic,Denmark,Estonia,Finland,France,
Germany,Hungary,Iceland,Ireland,Italy,Japan, Korea, Republic of Latvia, Liechtenstein, Lithuania,Luxembourg, Malta, Monaco, the Netherlands, New Zealand, Norway,Portugal, San Marino, Singapore, Slovakia,Slovenia, Spain, Sweden, Switzerland, United Kingdom
See more about visa process here