This is the 12102nd most frequent Polish word.
ludowe
"Ludowe" means "folk" or "people's" in English.
Here, 'ludowe' is used as an adjective describing 'tańce' (dances), indicating that the dances are of folk nature.
Polskie tańce ludowe są piękne.
Polish folk dances are beautiful.
In this context, 'ludowe' modifies 'przedmiotów' (items), signifying that the items possess characteristics typical of folk culture.
Muzeum posiada kolekcję przedmiotów ludowych.
The museum has a collection of folk items.
Here, 'ludowy' describes the 'styl' (style), referring specifically to its folk characteristics in architecture.