when did elf on a shelf originate

Elf on a Shelf is a Christmas tradition that originated in the United States in the early 2000s. The tradition involves placing a doll-like elf on a shelf or in a prominent location in a home to monitor the behavior of children. The elf is said to be Santa's helper and is believed to report back to Santa if the children are being naughty or nice. The elf is typically placed in a different location each night during the holiday season, and children are encouraged to talk to the elf, ask for wishes, and act well in order to earn good behavior.