The Visa Waiver Program (VWP) permits residents from participating nations to travel to the U.S. as non-settlers for business, transit, tourism, and clinical purposes. Persons traveling to the U.S. under the VWP (Visa Waiver Program) are allowed to stay in the U.S. for 90 days on each visit without any need for acquiring a visa. There are currently 39 nations that are participants and apply under VWP.
People are going under the VWP consent to defer their privileges to survey or appeal. In this way, acquiring an affirmed ESTA (Electronic System for Travel Authorization) doesn’t ensure an explorer's entry into the United States.