The Indo-European subgroup of languages includes the SLAVIC language, which is a branch of the Indo-European language family. It is spoken by more than 300 million people in Eastern Europe and is the official language of Russia, Belarus, Ukraine, Serbia, Croatia, Bosnia and Herzegovina, Montenegro, Macedonia, and Slovenia. It is also spoken in parts of Central Europe, the Caucasus, and Central Asia. SLAVIC languages are divided into three main branches: East SLAVIC, West SLAVIC, and South SLAVIC. East SLAVIC includes Russian, Ukrainian, and Belarusian; West SLAVIC includes Polish, Czech, and Slovak; and South SLAVIC includes Bulgarian, Macedonian, and Serbo-Croatian.