Answer:
You take out a channukiah and progressively light additional candles each night (the first night 1 plus the helper candle, second night 2 plus the helper candle, etc) until a total of 9 candles are lit. This is a celebration of the miracle of the oil that lasted for 8 nights even though it was only supposed to last 1 night and the successful battle against occupiers that attempted our forced assimilation to a pagan religion.
There is also a tradition of eating fried foods, primarily potato latkes (panckages) and sufganiyot (jelly doughnuts), and dairy foods.