The hanukkiyah is lit shortly after dark on each of the eight nights of Hanukkah and blessings are recited.
On the first night, one light is put on the right side of hanukkiyah. On each subsequent night, an additional candle or lamp is placed to the immediate left of the previous night’s. The candles are lit from left to right, so we begin with lighting the newest light.
Because these lights are intended for the sole purpose of making the story of Hanukkah known rather than for practicality, the shamash is used to light the other candles. If we do use the Hanukkah lights for a practical use, we say we are using the light of shamash! Some families also observe the custom of keeping on a secondary light source in the same room.