From 12 January 2009, anyone wishing to enter the USA on the Visa Waiver Programme must apply for Electronic Travel Authorisation.
This programme permits citizens of specific countries to enter the USA without a visa for a maximum of 90 days.
Click on this link to see which countries are eligible and apply as early as possible.
Validity
The ESTA authorisation is valid for 2 years and allows you to enter the USA multiple times within this period. Submit your application as early as possible. ESTA authorisation must be obtained for every traveller. Travellers without a valid ESTA authorisation will be refused boarding.