The Book of Esther is one of the books in the Hebrew Bible and the Christian Old Testament. It is a part of the Ketuvim, or Writings, and is traditionally attributed to the prophet Mordecai. The book tells the story of Esther, a Jewish woman who becomes the queen of Persia and plays a crucial role in saving her people from a plot to destroy them. The Book of Esther is notable for its themes of courage, faith, and the providence of God, and it provides valuable insights into the history and culture of the Persian Empire during the time it was written.