Answer:
The Eurozone is
the countries that use the euro as their common currency.
Step-by-step explanation:
The Eurozone is made up of the European Union (EU) countries that use the euro as their currency. It is a subset of the European Union. This implies that not all the EU member countries have adopted the use of the euro as their common currency. For example, before Brexit, Britain continued to use her pounds sterling instead of the euro. This shows that Britain was not then a part of the Eurozone, unlike other countries that have fully adopted the euro as their common currency.