Yōkai are supernatural creatures from Japanese folklore, often depicted as spirits or monsters. They can take various forms, ranging from mischievous to malevolent, and are believed to possess unique powers. Yōkai are an integral part of Japanese culture, appearing in stories, art, and festivals. These beings are categorized into different types, such as yurei (ghosts) and tengu (bird-like creatures). Yōkai often embody natural elements or human emotions, serving as a way to explain the unknown. Their presence in popular media, including anime and manga, has helped to keep these traditional figures alive in modern society.