Yurei are spirits in Japanese folklore, often depicted as the souls of the deceased who have not found peace. They are typically characterized by their white funeral garments and long, unkempt hair. Yurei are believed to linger in the physical world due to unresolved issues, such as unfinished business or a violent death. These spirits are commonly associated with various supernatural phenomena, including haunting locations or appearing in dreams. In traditional Japanese culture, rituals and offerings are made to appease Yurei and help them move on to the afterlife, reflecting the importance of honoring the dead.