The "Elf on the Shelf" is a toy figure that was created by Carol Aebersold and her daughters, Chanda Bell and Christa Pitts. It was originally inspired by a family tradition of telling stories about mischievous elves who would watch over the children and report back to Santa Claus about their behavior. In 2005, Aebersold and her daughters published a book called "The Elf on the Shelf: A Christmas Tradition" which featured the toy figure and its story. Since then, the "Elf on the Shelf" has become a popular holiday tradition for families all over the world.