Schengen refers to the EU passport-free zone that covers most European countries. It’s the largest free travel area in the world.
However, for stays longer than 90 days, such as for studying, working, or living in a Schengen country, you must apply for a national visa specific to that country, not a Schengen visa.
An EU passport is a passport issued by one of the 27 member states of the European Union and allows you to travel visa-free between all EU countries, and to a large number of third-countries the EU has bilateral agreements with.
EU passport holder is a citizen of one of the 27 EU countries and has the right to live, work, study and retire in any of the EU member states.