古文書 (こぶんしょ) refers to ancient documents or manuscripts in Japan, often written in classical Japanese. These texts can include historical records, literary works, and religious scriptures. They are valuable for understanding Japan's cultural and historical development. Many 古文書 are preserved in temples, shrines, and museums, providing insights into the lives of people from different eras. Scholars study these documents to learn about the language, society, and events of the past, making them essential for research in fields like history and literature.