The ETIAS visa waiver is a travel authorization that gathers information on non-Eu citizens, including Americans, before coming to the Schengen Area. ETIAS holders may only travel to the 26 countries that form the Schengen Area.
Do I need to apply for an ETIAS authorization to transit through the Schengen Area?
The ETIAS visa waiver was created to increase security in Europe, improve border control management, and close any information gaps that may exist between the Member State’s. This is achieved thanks to the ETIAS database which gathers information on all travelers. To enter the Schengen Area even if in transit you are still required to apply for an ETIAS travel authorization.