What is VISA waiver program?
The visa-free programme allows people from certain states to enter America United States or use them to travel without the need to obtain an entry US visa. However, if you’re citizens of any of these VWP countries and you are planning to travel towards America United States by air or by sea, you must get an ESTA VISA.
In this program, residents who are citizens of VWP countries are permitted for travel within the United States or use them for transit for a period of 90 days.
Read more about VWP here.