Azerbaijani or Azeri is a Turkic language from the Oghuz sub-branch. It is spoken primarily by the Azerbaijani people, who are native to the Azerbaijan region of Iran, as well as the Republic of Azerbaijan. The Iranian Azerbaijanis speak South Azerbaijani, while the ones in the Republic speak North Azerbaijani; but it is unclear whether these two varieties form one language, as the International Organization for Standardization (ISO) considers Northern and Southern Azerbaijani to be distinct languages.