The elf on the shelf is a fun tradition that many families follow during the holiday season. It involves placing a small elf doll in various places around the house and moving it every night so children can search for the elf's new hiding spot in the morning. It is meant to help create a sense of magic and wonder in the house during the holidays. The elf on the shelf is also often used as a way to promote good behavior in children, as the elf supposedly reports back to Santa each night about the child's behavior.