USA ESTA visa is important if you plan to travel to the United States for tourism or business for 90 days or less from a VWP country. All citizens living in a VWP country and plan to travel to the United States should apply for this visa. It is an online process where the approval is normally received within a couple of minutes once you apply for the visa. You should have a valid email address as the approval is sent via your email. Since there is a small payment involved, the applicant should also have a valid credit or debit card such as MasterCard, Visa, or Amex card. This article provides information on the requirements for USA visa.
You should have an electronic passport or your passport should have a machine-readable zone on the biographic page in order to apply for this visa. The visa is linked to your passport electronically. You should get a copy of the printout and present it to the airline or vessel when boarding them. There are designated flights and vessels for ESTA visa holders to travel. Make sure that you check with the relevant airline or shipping line if they are designated to carry ESTA visa holders.
The ESTA visa is valid for two years from the date of approval. You can travel multiple times within these two years. But if you change the name, citizenship or nationality within these two years, you should apply for a new ESTA. On the other hand, if your passport expires before the end of the two years, you have to reapply for the ESTA visa. These are important things to consider when applying for the ESTA visa to the United States.
The above read offers information on the electronic system for travel authorization when visiting the United States.