This week residents of the European Union will vote for the European Parliament. The elections are held over several days throughout the EU, starting in the Netherlands and the United Kingdom on Thursday.
The fact that the elections aren't all held on the same day, has to do with the different rules around elections in the various EU Member States, according to NU.nl.
In the Netherlands, for example, elections are never held on Fridays, Saturdays or Sundays - to take account of the holy days of the various religions represented in the country.
Other EU countries hold elections on Sunday because that is the day most people have off work. The Czech Republic sets aside two days for voting.
The European campaign for this election is already done, but there are still two campaign debates in the Netherlands on Wednesday evening.