Languages of the European Union which is understood by 51% of all adults, while German is the most widely used mother tongue, spoken by 18%. All 24 official languages of the EU are accepted as working languages, but in practice only two – English and French – are in wide general use and of these English is the more commonly used. French is an official language in all three of the cities that are political centres of the Union: Brussels (Belgium), Strasbourg (France) and Luxembourg City (Luxembourg). , the official languages of the European Union, as stipulated in the latest amendment of "Regulation No 1
European institutions in Strasbourg as the seat of diverse information relays of the European Union, such as the Information Centre on European Institutions (CIIE), the Euro-Info Centre (EIC), the MEDIA Antenna and the European Documentation Centre (EDC) as well as the European Job Mobility Portal, the EURES network. The city also hosted the automated computerised network Schengen Information System and currently hosts the central unit of its new version, the Schengen Information System II, a back-up unit being located in Austria. Other bodies based in the city, most of them unrelated either to the Council of Europe or the European Union but working in