The core ritual of the eight-day Hanukkah holiday is the lighting of the menorah, or hanukkiah. This nine-stemmed menorah is lit each evening of the holiday after sunset, with one candle added each additional night. It is customary to place the menorah in a window or some other publicly visible location to fulfill the custom of publicizing the miracle, in which a jar of oil sufficient to burn for one night burned for eight in the ancient Temple. Prior to lighting the candles each night, a series of blessings are recited.
Click here for more information on lighting the menorah, including audio recordings of the traditional Hanukkah blessing melodies.