The European Union is a group of countries whose governments work together.
It's a bit like a club.
They try to make things like buying and selling products to each other, and going to live and work in each other's countries, easier.
To join you have to agree to follow the rules and in return you get certain benefits.
How many countries in Europe are members of the EU?
Do you know what the Brexit is?
Find out more clicking on this link