Chagatai is a now-extinct Turkic language that was spoken in Central Asia from the 13th to 19th centuries and is an ancestor of the Uzbek, Uyghur, and Turkmen languages.
The language is named after the Chagatai Khanate, part of the Mongol Empire. Although Chagatai fell out of use after the rise of the USSR, its literature, writing system, and other facets strongly influenced the modern Uzbek and Uyghur languages.
At Indiana University, Uzbek and Uyghur are offered each academic year through the Department of Central Eurasian Studies.
Uzbek is also available as an intensive online course during the summer through the Language Workshop.