Bulgarian is a South Slavic language spoken by 8 million people, unique for having no case system and a distinctive head gesture for yes and no.

Croatian is a South Slavic language spoken by nearly 7 million people, known for its complex grammar and some of the longest words in the Slavic family.

Czech is a West Slavic language spoken by over 13 million people, known for its complex grammar and lack of articles.

Polish is a West Slavic language with over 45 million speakers, known for its complex consonant clusters and seven grammatical cases.

Russian is the most widely spoken Slavic language, with over 258 million speakers worldwide, using the Cyrillic alphabet.

Serbian is a South Slavic language with about 12 million speakers, unique for being written in both Cyrillic and Latin scripts.

Ukrainian is an East Slavic language with around 40 million speakers, featuring a unique letter ї and a rich literary tradition.