A shapeshifter is a mythical or fictional being that has the ability to change its physical form or appearance at will. This concept appears in various cultures and folklore, often associated with magic or supernatural powers. Shapeshifters can take on the form of animals, other humans, or even inanimate objects, allowing them to blend into different environments or situations. In literature and media, shapeshifters are commonly found in genres like fantasy and science fiction. Notable examples include characters from Norse mythology, such as Loki, and modern stories like Harry Potter, where the ability to transform plays a significant role in the plot.