The EU is an economic and political union with more than 500m people. This video explains in 90 seconds the structure of the EU, how it differs from other European organisations and where the UK fits.
Council Of Europe
It has 47 member states, covers approximately 820 million people and operates with an annual budget of approximately half a billion euros.
https://en.wikipedia.org/wiki/Council_of_EuropeEU
The European Union (EU) is a political and economic union of 28 member states that are located primarily in Europe. It has an area of 4,475,757 km2 (1,728,099 sq mi), and an estimated population of over 510 million
https://en.wikipedia.org/wiki/European_UnionEEA
31 states as of 2016
https://en.wikipedia.org/wiki/European_Economic_AreaEFTA
Current members Iceland, Liechtenstein, Norway, Switzerland
https://en.wikipedia.org/wiki/European_Free_Trade_AssociationSchengen area
The Schengen Area is an area comprising 26 European states that have officially abolished passport and all other types of border control at their mutual borders.
https://en.wikipedia.org/wiki/Schengen_AreaEU Customs Union
The European Union Customs Union (EUCU) is a customs union which consists of all the member states of the European Union (EU), Monaco, and some territories of the United Kingdom which are not part of the EU.
https://en.wikipedia.org/wiki/European_Union_Customs_Union
https://www.ft.com/video/fd7df6da-b254-3013-b5b7-e9885b3789be