Headcanon refers to a personal and unofficial interpretation or belief about a fictional story or universe that is not explicitly stated in the original material. It is essentially a fan's personal "canon" or version of the story. Headcanons can range from small details or character traits to broader theories about the story's world-building or interactions between characters. They are not considered official or canon but can be a way for fans to connect with the material and explore their own ideas about it.
