ETIAS stands for European Travel Information and Authorization System. It is a completely electronic system that allows and keeps track of visitors from countries who do not need a visa to enter the Schengen Zone. In a way, it resembles the U.S. Electronic System for Travel Authorization (ESTA), which serves a similar purpose.
Also, there should be no confusion that there are countries in the EU that are not members of the Schengen Zone, which the ETIAS authorization doesn’t prevent you from entering.
The legal procedures to pass the ETIAS started in 2016, and the system is expected to be fully operational in November 2023.
The ETIAS will undergo a detailed security check of each applicant to determine whether they can be allowed to enter any Schengen Zone country. While citizens of countries who do not need a visa for travel purposes of up to 90 days in the EU do not need to go through a long process of applying for the visa, the ETIAS will make sure that these people are not a security threat. This travel authorization system will gather, keep track of, and update necessary information regarding visitors to determine whether it is safe for them to enter Schengen countries.
The ETIAS, besides being used for business and tourist purposes, will also allow people to visit the Schengen countries for medical and transit reasons. In addition, it will be mandatory for all countries that are Schengen visa-free.