what does elf on a shelf mean

Elf on a Shelf is a popular Christmas tradition that involves placing a small elf doll on a shelf or other high spot in the home. The elf is said to watch the children's behavior and report back to Santa Claus every night. It's believed that the elf moves to a new location each morning, bringing a bit of magical fun to the holiday season. The elf is also often used as a tool to encourage good behavior in children during the weeks leading up to Christmas.