Elf on the shelf is a beloved holiday tradition that originated in Germany. It involves a mischievous elf, usually dressed in a red and white outfit, who magically appears in a child's home before Christmas. The elf's purpose is to observe the child's behavior and report back to Santa Claus if they've been naughty or nice. Every night, the elf moves to a new location in the home, ensuring the child stays on their best behavior. Some families also have fun with the elf, making it a part of their holiday festivities.