Usually that is "languages", but it could be "idioms" in some contexts.
"Idiomas" in English means "languages"
What/which languages
"¿Qué idiomas hablas?" translates to "What languages do you speak?" in English.
It means "What languages do you learn in school?" in English.
"¿Cuántos idiomas sabes? ¿Cuáles son?" means "What languages do you know? What are they?"
Languages
Tu conoces muchos idiomas (informal) Usted conoce muchos idiomas (formal)
well, que idiomas hablan en ese pais means....what languages do they speak in that country?
"What languages do you speak?"
Amantes de los idiomas
Los idiomas son divertidos.
It means "I speak many languages."