As of January 12th 2009 ESTA became mandatory for all passengers travelling to the United States under the Visa Waiver Program (VWP).
Travelers not exempt of VWP(Visa Waiver Program) application to travel to the USA must attain an advanced approval of travel through ESTA before entering USA.
esta-app.org web site is an agency to receive and verify the information of the applicant who wish to enter USA with the purpose of short term stay for sightseeing and business, and to make the application on behalf of the applicant.
When ESTA is applied, 3 results are possible, approval, withhold, or denial, are issued. Approval and denial is finalized within 72 hours.
If denied, you should receive VISA from the US Embassy or consulate in the country.
You can apply online for Electronic System for Travel Authorization using the ESTA Application Check & Send Service on this website. The fee is $78.78 and each person will need to provide details of their full name, date of birth, country of origin, passport information, gender, and email address. Please note that the information about ESTA as well as the application is completely free. Our fee is for using our check and send service in making this application process as quick and as easy as possible, providing you with our full help and support, free update service, quick and secure payment through our secure gateway, providing a downloadable copy of your approved application in "pdf" format, and an email confirmation which will be sent upon successful authorization. www.esta-app.org web site is a specialized agency for ESTA application, and is not related to the US government or embassy, so please keep this in mind when making the application.