A "Changeling" is a creature from folklore, often depicted as a fairy or elf that replaces a human child. This concept is prevalent in various cultures, particularly in European traditions. The belief was that fairies would take a healthy human baby and leave a sickly or deformed one in its place, causing distress for the family. In literature and popular culture, changelings are often used to explore themes of identity and belonging. They can symbolize the fear of loss or the idea of being different. Stories featuring changelings frequently involve quests to reclaim the original child or confront the nature of reality and perception.