The traditional way of entering to the USA visa from a US embassy or consulate. However, you introduce Visa Waiver Program, which makes from 38 countries. This process is known as an ESTA, it is a stand on Electronic System for Travel Authorization. As part of the Visa Waiver Program, it allows citizens of member countries to travel to the USA without a visa.
If you are visiting the United States for business or traveling purposes and must need to every traveler’s visa, so ESTA is a is a simple, inexpensive and online process which takes just a few minutes to complete. But your trip is less than 90 days in length. You avoid the complications, long procedures, while now no waiting, no appointments and low cost of getting a visa. Most of the people ESTA Apply Online who will be staying in the USA for a period of 90 days or less.
Nevertheless, the ESTA also allows travelers to entering for other purposes, like for business (not forgetting that business is different from working in the states), short study programs, medical purposes and connecting flights.