Sadako Yamamura is a fictional character from the horror film series The Ring, which is based on the Japanese novel Ring by Koji Suzuki. She is depicted as a vengeful spirit who emerges from a cursed videotape, bringing death to those who watch it within seven days. In the story, Sadako is portrayed as a young girl with supernatural abilities, including the power to manipulate objects and create terrifying visions. Her tragic backstory involves themes of isolation and betrayal, which contribute to her haunting presence in the films.