The Visa Waiver Program (VWP) allows nationals of certain countries to travel to the U.S. for business or tourism for stays 90 days or less without obtaining a visa. This is due to the treaty between their countries and the U.S. VWP travelers must apply for authorization through the Electronic System for Travel Authorization (ESTA), be screened at their port of entry into the U.S., and actively enrolled in the Department of Homeland Security’s Office of Biometric Identity Management.