This is the Jewish Festival of Maccabees, the Feast of Consecration or the Festival of Lights. Hanukkah is also spelled Chanukah. In Hebrew, Hanukkah means "Dedication".
The story of Hanukkah began in 167 BC when Jerusalem was ruled by the Greek Empire. The Jews were forced by King Antiochos IV to renounce their religion to worship the Greek gods. This resulted in a revolt unleashed by the Jews and Judas Macabeus who was appointed as leader of the revolt. Therefore, this holiday pays tribute to the Jews who restored the temple in Jerusalem while fighting the Greeks for three whole years.