Chagatai language

Chagatai (چغتای, Čaġatāy), also known as Turki, Eastern Turkic, or Chagatai Turkic (Čaġatāy türkīsi), is an extinct Turkic literary language that was once widely spoken across Central Asia and remained the shared literary language there until the early 20th century. It was used across a wide geographic area including western or Russian Turkestan (i.e. parts of modern-day Uzbekistan, Turkmenistan, Kazakhstan, Kyrgyzstan), eastern or Chinese Turkestan (where a dialect, known as Kaşğar tılı, developed), the Crimea, the Volga region (such as Tatarstan and Bashkortostan), etc. Literary Chagatai is the predecessor of the modern Karluk branch of Turkic languages, which includes Uzbek and Uyghur. Turkmen, which is not within the Karluk branch but in the Oghuz branch of Turkic languages, was nonetheless heavily influenced by Chagatai for centuries.

Ali-Shir Nava'i was the greatest representative of Chagatai literature.

Chagatai literature is still studied in modern Uzbekistan, where the language is seen as the predecessor and the direct ancestor of modern Uzbek, and the literature is regarded as part of the national heritage of Uzbekistan.