Shape-shifting refers to the ability to change one's physical form or appearance. This concept is often found in mythology, folklore, and fiction, where characters can transform into animals, other humans, or even inanimate objects. Shape-shifting can symbolize adaptability and the fluid nature of identity. In various cultures, shape-shifters are depicted as magical beings or deities, such as the Norse god Loki or the Native American skinwalkers. In modern media, shape-shifting is a popular theme in movies, books, and television shows, often exploring themes of transformation and the duality of human nature.