Visa Waiver Program
The Visa Waiver Program (VWP) allows citizens of participating countries to travel to the United States (U.S.) without a visa for stays of 90 days or less if they meet certain requirements. Travelers must be eligible to use the VWP and have a machine-readable passport at the U.S. port of entry to enter the U.S. without a visa; otherwise a U.S. visa is required. Currently, 38 countries participate in the VWP. Other foreign citizens will need a nonimmigrant visa. You can find the eligibility and requirements for VWP travelers here.
Visitor visas are nonimmigrant visas for persons who want to enter the United States temporarily for business, tourism, pleasure or visiting, or a combination of both purposes. Conference attendees require a Business Visitor Visa (B-1). The visa, placed in your passport when issued, allows you to travel to a U.S. port-of-entry (e.g., airport) and request permission of the Department of Homeland Security (DHS), Customs and Border Protection immigration officer to enter the U.S. You can find information on the visitor visa here.
Advance planning can smooth the visa application process for you. Apply for your visa well in advance of your travel! You can determine your estimated application time by visiting here. Review your visa status now to determine if you need a US visa or visa renewal and to find out how to schedule an interview appointment, pay fees, and other vital instructions.