"교리서" refers to a religious text that outlines the fundamental beliefs and doctrines of a particular faith. It serves as a guide for followers, helping them understand the core principles and teachings of their religion. These texts often include interpretations of sacred scriptures and explanations of rituals and practices. In many traditions, such as 기독교 or 불교, 교리서 plays a crucial role in educating adherents about their faith. It can be used in religious education, sermons, and personal study, ensuring that the teachings are preserved and passed down through generations.