Purim is a Jewish holiday celebrated on the 14th day of Adar to commemorate the survival of the Jewish people from Haman's plot to kill them as recorded in the Book of Esther. Key events include Esther revealing to the king that she was Jewish and convincing him to stop Haman's plan, resulting in the Jews surviving and celebrating with costumes, drinking, eating hamantaschen pastries, and booing whenever Haman's name is read from the Megillah scroll.