Chagatai refers to one of the major divisions of the Mongol Empire, named after Chagatai Khan, the second son of Chinggis Khan. This khanate played a vital role in the Mongol Empire's expansion and administration, encompassing parts of Central Asia and maintaining a significant influence over trade routes and cultures in the region. It is known for its unique blend of Mongolian and Persian cultures, which significantly shaped the social and political landscape of the territories it governed.