B1/B2 & WB/WT Status
Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for temporary stay, or an immigrant visa for permanent residence. The visa allows a foreign citizen, to travel to the United States port-of entry and request permission of the U.S. immigration inspector to enter the U.S. The "visitor" visa is a nonimmigrant visa for persons desiring to enter the United States temporarily for business (B-1), for pleasure or medical treatment (B-2), or combination of both (B-1/B-2) purposes.
B-1 Business Visitor Visa
For example, if the purpose for your planned travel is to consult with business associates, travel for a scientific, educational, professional or business convention, or conference on specific dates, settle an estate, or negotiate a contract, then a business visitor visa (B-1) would be the appropriate type of visa for your travel. After reviewing this website information, should you need additional information about business related (B-1) visitor visas visit https://travel.state.gov/content/travel/en/us-visas/business.html.
B-2 Pleasure, Tourism, Medical Treatment Visitor Visas
As examples, if the purpose of your planned travel is recreational in nature, including tourism, amusement, visits with friends or relatives, rest, medical treatment, and activities of a fraternal, social, or service nature, then a visitor visa (B-2) would be the appropriate type of visa for your travel.
* NOTE: An alien classifiable as a B-1 or B-2 visitor can be admitted without a visa, as long as certain criteria are met, under the terms of the Visa Waiver Pilot Program. Among the criteria are that the alien be classifiable as a B visitor, have a valid passport issued by a designated country, intend to visit the United States for a period not exceeding 90 days, and be in possession of a round-trip transportation ticket that is nonrefundable except in the country of issuance.
For a list of participating countries and additional information visit: https://travel.state.gov/content/travel/en/us-visas/tourism-visit/visa-waiver-program.html