Electronic Travel Authorization (ESTA) application form is an online system implemented by the United States Government and managed by the Department of Homeland Security, that determines the eligibility of citizens or nationals of designated countries to travel to the United States, prior to initiating the travel. The purpose of this application is to conduct an initial screening of passengers before opening the right to enter the United States. The online form replaces the onboard paper and customs entry requirements for all passport holders of visa waiver countries. Electronic Travel Authorization (ESTA) application forms became mandatory on January 12, 2009, to reinforce security. All travelers on business or holiday, from countries who previously were beneficiaries of the Visa Waiver Program (VWP) must now apply online and obtain an ESTA before their trip to the United States.
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