Certain international travellers may be eligible to travel to the United States without a visa if they meet the requirements for visa-free travel. The Visa section of the website below is all about U.S. visas for foreign citizens to travel to the United States. U.S. Visas (state.gov)
A foreign national travelling to the United States to conduct temporary business needs a visitor visa (B-1) unless qualifying for entry under the Visa Waiver Program. Business (state.gov)
Visitor Visa B
For travel to the United States to conduct temporary business.