ESTA is the electronic system for travel authorisation for entering the USA under the Visa Waiver Program.

ESTA stands for "Electronic System for Travel Authorisation" and is the electronic travel authorisation system for entering the Unites States of America. The competent authority is the Department of Homeland Security (DHS).

All citizens or nationals of the Visa Waiver Program countries are eligible to travel to the USA under the Visa Waiver Program.