真言宗 (Shingon Buddhism) is a major school of Japanese Buddhism founded by the monk 空海 (Kūkai) in the early 9th century. It emphasizes esoteric teachings and practices, focusing on the use of mantras, rituals, and meditation to achieve enlightenment. Shingon means "true word," reflecting its belief in the power of sacred sounds. The core of Shingon practice involves the worship of the 大日如来 (Dainichi Nyorai), the cosmic Buddha. Followers engage in various rituals, including the use of mandalas and mudras, to connect with the divine. Shingon Buddhism has significantly influenced Japanese culture, art, and spirituality.