For Arabic I think being the language of Quran holly book for Muslims' made much non Arab speakers know basics of Arabic language, so people from Iran, Pakistan, many African countries especially chad has good base in Arabic language, also Turkish people, maybe Indonesians and Malaysians especially those who study here in AL Azhar university, Israel so I think Arabic is somehow spread language , ofc like every other language it varies from country to another, Egyptians don't speak like Maghreb countries or people in Sham areas ( Palestine, Syria and Lebanon) and gulf countries, etc each ethnic groups has different way of expressing language but at the end of the day we understand each other