A "Elf on the Shelf" is a beloved Christmas tradition that began in the United States. The "Elf on the Shelf" is a small, mischievous elf that is placed in a family's home by Santa to observe children's behavior and report back to him on Christmas Eve. The elf is often dressed in red and white and has a magical ability to move around the home while the family is sleeping. If you wish to purchase a "Elf on the Shelf," you can do so online or at many retail stores, including Barnes & Noble, Target, Walmart, and Amazon.