The "Divan-u Lugat-it-Turk" is a significant Turkish dictionary and linguistic work compiled by the scholar Mahmud al-Kashgari in the 11th century. It serves as a comprehensive resource for the Turkic languages, documenting vocabulary, grammar, and cultural insights of various Turkic tribes. This dictionary is notable for its systematic approach, including definitions, examples, and illustrations of the words in context. It also highlights the rich cultural heritage of the Turkic peoples, making it an essential reference for linguists and historians studying the evolution of the Turkish language and its dialects.