There are 2 types of countries where Erasmus+ is active.
EU Member States and third countries associated to the Programme
These can fully take part in all the actions of the Erasmus+ Programme. They include all EU countries, members of the European Free Trade Association (EFTA), candidate EU countries and others. They were previously called Programme countries.
Third countries not associated to the Programme
These can take part in certain Erasmus+ actions. There are many of these, spanning the globe. They were previously called Partner countries.