The Visa Waiver Program (VWP) enables most citizens or nationals of participating countries* to travel to the United States for tourism or business for stays of 90 days or less without obtaining a visa.
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It may take up to 72 hours to find out if you are authorized to travel to the U.S. under the VWP. Each approved ESTA application is generally valid for two years and allows multiple visits to the U.S. within that period without having to apply for another travel approval.
Overstays & Unlawful PresenceIf you enter the United States with a valid visa (for example, a tourist or student visa) and overstay by less than 180 days, your visa will be considered void and you'll need to get a new visa in your home country if you want to come back to the United States.