where does elf on the shelf come from

Elf on the shelf is a popular Christmas tradition in which a special elf is placed in the home by Santa as a magical helper. The elf is said to watch children throughout the year, reporting their behavior back to Santa. This tradition is based on the story of "An Elf's Story," which tells of an elf who is sent to the human world to watch over children and ensure they behave well. The elf is also said to bring Christmas magic into the home, bringing joy and cheer to children during the holiday season.