Middle Korean is the historical stage of the Korean language spoken from the 10th to the 16th centuries. It evolved from Old Korean and is characterized by significant phonetic and grammatical changes. The language was used in various texts, including poetry and official documents, reflecting the culture and society of the time. The writing system during this period primarily utilized Hanja, Chinese characters, alongside the early forms of Hangul, which was developed in the 15th century. Middle Korean serves as a crucial link in understanding the evolution of the Korean language and its modern forms.