what is a elf on the shelf

The Elf on the Shelf is a fictional character in a book series by Carol Aebersold. It is a Christmas tradition in which a child receives an elf doll as a gift and the elf becomes their constant companion. The elf has the ability to watch the child's behavior and report back to Santa at night. Each day, the elf moves to a new location in the house as a way of reminding the child to be good. The concept of the Elf on the Shelf has become a popular holiday tradition and a beloved character for many families.