Definition
ESTA
Electronic System for Travel Authorization for Visa Waiver Program travelers.
ESTA is required for visitors from Visa Waiver Program countries who travel to the U.S. by air or sea for up to 90 days. Approval is generally good for 2 years. ESTA travelers cannot extend their stay or change status from inside the U.S.
See also
Not legal advice. Definitions are provided for educational use. For case-specific guidance, consult a licensed immigration attorney.