The Electronic System for Travel Authorization (ESTA) is an automated system that determines the eligibility of visitors to travel to the United States under the Visa Waiver Program (VWP). ESTA was mandated by the Implementing Recommendations of the 9/11 Commission Act of 2007 for travelers from VWP countries arriving in the U.S. by air or sea. Authorization via ESTA does not determine whether a traveler is admissible to the United States. U.S. Customs and Border Protection (CBP) officers determine admissibility upon travelers’ arrival. The ESTA application collects biographic information and answers to VWP eligibility questions.