If you are traveling to the USA, the days of filling out a green Visa Waiver form on a plane for entry into the US have ended.
You now need to fill in an online request to enter the States, at least three days before travelling, otherwise you may be turned away at US immigration.
The process is called the Electronic System for Travel Authorisation form or ESTA for short. The only way to apply is online, but it is a painless process and you'll usually get a decision in minutes, although it can take up to a few days. Once done the ESTA lasts for 2 years or until your passport expires which ever comes first.
It is free, and you do not need to use those links on the internet which charges for the service. Below is a link to the US governments own free website to allow you to do the application yourself.
Free ESTA application link
