Chanukah, the Jewish festival of rededication, also known as the festival of lights, is an eight day festival beginning on the 25th day of the Jewish month of Kislev.
According to tradition as recorded in the Talmud, at the time of the rededication, there was very little oil left that had not been defiled by the Greeks. Oil was needed for the menorah (candelabrum) in the Temple, which was supposed to burn throughout the night every night. There was only enough oil to burn for one day, yet miraculously, it burned for eight days. An eight day festival was declared to commemorate this miracle. Note that the holiday commemorates the miracle of the oil, not the military victory: Jews do not glorify war.
The only religious observance related to the holiday is the lighting of candles. The candles are arranged in a candelabrum called a Hanukia. Many people refer to the Hanukia incorrectly as a menorah. The name menorah is used only to describe the seven-branched candelabrum that was housed in the Jewish Temple. The Hanukiah holds nine candles: one for each night, plus a shamash (servant) at a different height. On the first night, one candle is placed at the far right. The shamash candle is lit and three blessings are recited: l’hadlik neir (a general prayer over candles), she-asah nisim (a prayer thanking G-d for performing miracles for our ancestors at this time), and she-hekhianu (a general prayer thanking G-d for allowing us to reach this time of year). The first candle is then lit using the shamash candle, and the shamash candle is placed in its holder. The candles are allowed to burn out on their own after a minimum of 1/2 hour. Each night, another candle is added from right to left (like the Hebrew language). Candles are lit from left to right (because you pay honor to the newer thing first).
This is my Hanukiah