The Elf on the Shelf is a popular Christmas tradition that involves a small elf doll. According to the story, the elf is sent from the North Pole to watch over children during the holiday season. Each night, the elf flies back to report to Santa Claus about the children's behavior, returning to a different spot in the house each morning. Families often place the elf in various locations, creating fun surprises for children to find. The tradition encourages good behavior, as children believe the elf is watching them. The elf's presence adds excitement and magic to the countdown to Christmas.