Newsround on EU vote: Poland and Spain tour - a preview
13 June 2016 Last updated at 07:53 BST
Adults across the UK will vote next Thursday on a decision that could affect our lives for years to come.
The choice? Whether the UK should stay in - or leave - a club of 28 countries in Europe called the European Union, or EU.
The decision is up to adults, but whatever is decided will affect your futures too.
So between now and the big vote on 23 June, Nazia and Ricky will be finding out what kids in different parts of the UK think - as well as meeting children in other parts of the European Union.