What is ESTA application?
USA ESTA is an acronym as Electronic System for Travel Authorization( Electronic Travel Authorization System) It applications can replace the visa requirement for citizens of VWP countries who travel in United States. United States. Once the US ESTA is accepted it’s valid for for two years or until the passport expires.
The application permits citizens from VWP members to go to in the United States for 90 days without the requirement of the visa.
Learn the full details regarding USA ESTA here.