Avestan literature refers to the sacred texts of Zoroastrianism, the ancient religion founded by the prophet Zoroaster. The primary text is the Avesta, which includes hymns, rituals, and religious laws. Written in the Avestan language, these texts are crucial for understanding the beliefs, practices, and cosmology of Zoroastrianism. The Avesta is divided into several sections, including the Yasna, which contains liturgical texts, and the Visperad, which supplements the Yasna. Other important parts include the Vendidad, a collection of laws and myths. Together, these texts provide insight into the spiritual and ethical framework of one of the world's oldest monotheistic religions.