Traditional Jewish practice usually lights two Shabbat candles before Shabbat begins each week.
The candles are lit shortly before sunset on Friday, marking the transition from the ordinary week into Shabbat. The two lights are commonly associated with the biblical commands to “remember” and “observe” Shabbat, although the custom developed through rabbinic interpretation and later practice.
Many households use two candles, but the number is not completely uniform. Some families add a candle for each child, and some communities have additional customs. The key requirement in traditional practice is creating light for Shabbat and honoring the sacred day.
Shabbat candles are generally lit by women in traditional Jewish homes, though anyone may perform the lighting. After lighting, a blessing is recited, and the candles are normally allowed to burn safely through part of the evening. They are not extinguished as part of the ceremony.