EU, EEA and Schengen countries

What are the 27 EU countries? What are the EEA countries? And which countries are members of the Schengen area? See the lists of countries below.

The Schengen area consists of 22 of the 27 EU member states plus the 4 EFTA countries:

The EU member states Bulgaria, Croatia, Cyprus, Ireland and Romania are not Schengen countries.