The Budapest Metro is the rapid transit system in the Hungarian capital Budapest. Opened in 1896, it is the world's second oldest electrified underground railway after the City and South London Railway of 1890, now a part of London Underground, and the third oldest underground railway with multiple stations, after the originally steam-powered Metropolitan Railway, now a part of London Underground (1863), and the Mersey Railway, now part of Merseyrail in Liverpool (1886).

Hungarian is a Uralic language spoken in Hungary and parts of several neighbouring countries. It is the official language of Hungary and one of the 24 official languages of the European Union. Outside Hungary, it is also spoken by Hungarian communities in southern Slovakia, western Ukraine (Transcarpathia), central and western Romania (Transylvania), northern Serbia (Vojvodina), northern Croatia, northeastern Slovenia (Prekmurje), and eastern Austria (Burgenland).