Both Azerbaijani varieties are members of the Oghuz branch of the Turkic languages. The standardized form of North Azerbaijani (spoken in the Republic of Azerbaijan and Russia) is based on the Shirvani dialect, while South Azerbaijani uses the Tabrizi dialect as its prestige variety. Since the Republic of Azerbaijan's independence from the Soviet Union in 1991, Northern Azerbaijani uses the Latin script. South Azerbaijani, on the other hand, has always used and continues to use the Perso-Arabic script. Azerbaijani language is closely related to Gagauz, Qashqai, Crimean Tatar, Turkish, and Turkmen, sharing varying degrees of mutual intelligibility with each of those languages.
