As of 2023, citizens eligible to apply for ESTA (Electronic System for Travel Authorization) can do so by the U.S. Visa Waiver Program (VWP). This allows eligible citizens to travel to the U.S. for tourism or business for up to 90 days without a visa.
Please see our updated Vlog regarding news around the current Trump Administration and updated recommendations regarding entering the US on an ESTA, the permissible activities on an ESTA and those only permitted on B1 visa and what is the advantage and disadvantage of an ESTA verses a visa issued in your passport.