The USA ESTA Application is an online travel authorisation used by eligible travellers who want to travel to the United States under the Visa Waiver Program. ESTA is not a traditional visa, so travellers should first confirm that their nationality and travel purpose qualify. The application asks for passport and personal information, travel details, and answers to eligibility questions. Check every answer carefully before submitting because incorrect information can create problems when travelling. It is best to apply before making your journey rather than waiting until the last minute. Once approved, keep your ESTA information and passport details available. Remember that an approved ESTA does not guarantee entry; the final decision is made by U.S. Customs and Border Protection when you arrive.