During which Jewish festival is the Book of Esther read annually?

The Book of Esther is read annually during the Jewish festival of Purim, which commemorates the events recorded in the book itself. Purim celebrates the deliverance of the Jewish people from Haman's plot to annihilate them, as depicted in Esther. This festival is observed with a sense of joy and festivity, including the reading of the Megillah (the Scroll of Esther) in synagogues, which serves as both a reminder of the historical events and an opportunity for reflection on themes of courage, faith, and divine intervention. These elements highlight why Purim specifically is associated with the reading of Esther, making it the correct answer in this context.