In Japanese folklore, a yōkai refers to a class of supernatural beings or spirits that can be malevolent or benign. They embody various aspects of nature, human fears, and cultural beliefs, often taking on forms ranging from monstrous creatures to everyday objects. Yōkai play a significant role in Japanese culture and storytelling, influencing traditions, art, and festivals. They are frequently featured in literature, film, and anime, symbolizing the unknown and the mystical elements of life.