Euro-Zone* is composed of 17 countries: 

Austria

Belgium

Cyprus 

Estonia 

Finland 

France 

Germany

Greece

Ireland

Italy
Luxembourg

Malta

Netherlands 

Portugal

Slovakia

Slovenia

Spain

They share the same monetary policy and currency, Euro €.

Euro-Zone* countries are part of European Union.

European Union is composed of 27 countries: 

Austria* 

Belgium* 

Bulgaria 

Cyprus* 

Czech Republic

Denmark 

Estonia* 

Finland*
France*

Germany* 

Greece*

Hungary 

Italy* 

Latvia 

Lithuania 

Luxembourg* 

Malta* 

Netherlands* 

Poland

Portugal*

Republic of Ireland* 
Romania

Slovakia*

Slovenia*

Spain* 

Sweden 

United Kingdom

They share the same economic and political views.
European Union citizens can move freely between member states to live, work, study or retire in another European Union country.