ESTA (Electronic System for Travel Authorization) is a mandatory electronic authorization

For citizens of countries participating in the Visa Waiver Program. It allows travel to the United States.

for tourism, business or transit purposes, for a maximum period of 90 days, without the need to obtain a traditional visa.

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ESTA does not guarantee entry into the United States but authorizes the traveler to board the plane.

of an airplane or ship bound for the USA.