There is a difference between travel within your country and travel to some other country or say, difference between domestic and international travel.
Domestic or international travel as a tourist
The country to which you are a citizen doesn’t require passport and visa or other document for interstate travel, but if you need to cross your own country’s border to land into some other country, you require a passport and visa or some other document in lieu of visa. It is a mandatory requirement, though some countries have easy visa processing and some countries even allow visa-free entry by issuing travel authorization document in lieu of visa for short-term visits. Some countries have visa on arrival program and your short-term visa will be issued when you land in that country.
Autorisation de Voyage (SEAV ou ESTA): Travel authorization document
Different countries have different rules for international travelers. It depends which country’s passport you hold. Autorisation de Voyage (SEAV ou ESTA) or Travel Authorization (SEAV or ESTA) is a good option for visas-free entry, but this facility can be availed for a short-term visit for specific purpose only. Preparing a trip to United States is no easy because landing into this country requires a valid visa.
Entering into US on Autorisation de Voyage (SEAV ou ESTA)
The US visa process is cumbersome and there may be a chance of denial during the personal interview for the reason you may not even know. However, US also allows visa-free entry to tourists of some countries for short-term visit for specific purposes. This facility is made available under visa-waiver program, on issue of electronic travel document. The Electronic System for Travel Authorization (ESTA) or SEAV (Electronic Travel Authorization System) is an intelligence system used by the United States Department of Homeland Security. Autorisation de Voyage (SEAV ou ESTA) is an easy way to enter into United States without obtaining a tourist visa. Planning a trip by a French citizen to United States is a complicated process, but the visa exemption program is good option for French citizens who wish to enter into United States as a tourist.