The Elf on the Shelf is a popular Christmas tradition that began in 2005, inspired by the children's book of the same name. The story follows a toy elf who is sent by Santa to keep an eye on children during the holiday season. Each night, the elf returns to Santa's workshop to report on the child's behavior, good or bad. In the morning, the elf appears in a new location in the home, a sign that they are watching. The tradition has become a popular way for families to create special memories and keep the magic of Christmas alive.