Classical Persian is a historical form of the Persian language that was used from the 9th to the 19th centuries. It is characterized by its rich literary tradition, including poetry and prose, and was the language of many famous works, such as those by Rumi and Hafez. This language evolved from Middle Persian and served as a cultural and literary medium in regions like Iran, Afghanistan, and parts of Central Asia. Classical Persian played a significant role in the development of modern Persian and influenced many other languages in the region.