Known as the Festival of Lights, Hanukkah celebrates the re-dedication of the Second Temple in Jerusalem during the second century B.C. The event occurred when Jews rose up against Greek-Syrian rulers in the Maccabean Revolt and drove them out of Jerusalem, according to the History Channel.
To mark their victory, Jews wanted to reclaim the temple and light its menorah, but only found enough pure olive oil for one day, according to Chabad.org. That one-day supply lasted eight and is considered a miracle in Jewish faith.
Every year, Hanukkah begins on 25th day of Kislev, a month in the Hebrew calendar. It lasts eight nights (yes, because of the oil) and this year it’s from Dec. 22-30.