also called Electronic System for Travel Authorization · US travel authorization
The United States' online travel authorization that citizens of Visa Waiver Program countries must obtain before flying to the US for short visits without a visa.
An ESTA is the online permission Americans require from certain countries before flying to the US for a short visit without a full visa. It is easy to muddle with an ETA, which other countries run under a similar name; the ESTA is specifically the US one. Crucially it is permission to travel, not a promise of entry and not a visa, so you still cannot work on it and an officer at the border can still turn you away.
You get your ESTA approved, treat it as a done deal, and mention to the US border officer that you will be doing some remote work for a US client while you visit. That is beyond what the ESTA covers, and the officer can pull you aside despite the approval sitting in your email.
An approved ESTA is permission to travel, not a guarantee of entry, and it is not a visa, so you still cannot work on it and a border officer can still refuse you. People treat approval as a green light and overstep. Apply well before travel, and remember it only covers short tourist or business visits, not remote work for a US client.
The difference is the whole point, so here is each one in a line.
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