Hanukkah is the Hebrew festival of Lights
as written on Chabad.org
In the second century BCE, the Holy Land was ruled by the Seleucids (Syrian-Greeks), who tried to force the people of Israel to accept Greek culture and beliefs instead of mitzvah observance and belief in G‑d. Against all odds, a small band of faithful Jews, led by Judah the Maccabee, defeated one of the mightiest armies on earth, drove the Greeks from the land, reclaimed the Holy Temple in Jerusalem and rededicated it to the service of God.
When they sought to light the Temple's Menorah (the seven-branched candelabrum), they found only a single cruse of olive oil that had escaped contamination by the Greeks. Miraculously, they lit the menorah and the one-day supply of oil lasted for eight days, until new oil could be prepared under conditions of ritual purity.
To commemorate and publicize these miracles, the sages instituted the festival of Chanukah.
At the heart of the festival is the nightly menorah lighting. The menorah holds nine flames, one of which is the shamash (“attendant”), which is used to kindle the other eight lights. On the first night, we light just one flame. On the second night, an additional flame is lit. By the eighth night of Chanukah, all eight lights are kindled.
Special blessings are recited, often to a traditional melody, before the menorah is lit, and traditional songs are sung afterward.
A menorah is lit in every household (or even by each individual within the household) and placed in a doorway or window. The menorah is also lit in synagogues and other public places. In recent years, thousands of jumbo menorahs have cropped up in front of city halls and legislative buildings, and in malls and parks all over the world.
We recite the special Hallel prayer daily, and add V’Al HaNissim in our daily prayers and in the Grace After Meals, to offer praise and thanksgiving to G‑d for “delivering the strong into the hands of the weak, the many into the hands of the few ... the wicked into the hands of the righteous.”
Chanukah begins on the eve of Kislev 25 and continues for eight days. On the civil calendar, it generally coincides with the month of December.
Since the Chanukah miracle involved oil, it is customary to eat foods fried in oil. The Eastern-European classic is the potato latke (pancake) garnished with applesauce or sour cream, and the reigning Israeli favorite is the jelly-filled sufganya (doughnut).
On Chanukah, it is customary to play with a “dreidel” (a four-sided spinning top bearing the Hebrew letters, nun, gimmel, hei and shin, an acronym for nes gadol hayah sham, “a great miracle happened there”). The game is usually played for a pot of coins, nuts, or other stuff, which is won or lost based on which letter the dreidel lands when it is spun.
In today’s consumer-driven society, people tend to place great importance on giving Chanukah gifts. However, the tradition is actually to give Chanukah gelt, gifts of money, to children. In addition to rewarding positive behavior and devotion to Torah study, the cash gifts give the children the opportunity to give tzedakah (charity). This has also spawned the phenomenon of foil-covered “chocolate gelt.”
Because Chabad.org is such a wonderful site I decided to copy their words here because the explanation is fantastic. Check out all the Jewish holidays there, so many of them are so beautiful and such poignant reminders of how many blessings you truly have in your life. I am very blessed to have many Jewish friends and every one of them is special and amazing.