The elf on the shelf is a popular toy and decoration that has become a holiday tradition for many families. It is a small, doll-like figure that is supposed to watch over children and report their behavior back to Santa Claus. The elf's name is not specified, but many people have given it names like "Elfie," "Scout," or "Buddy." It is said that the elf comes to life at night when no one is watching, and moves around to different places in the home, which is why children often find it in unexpected places in the morning.