The celebration that marks the winter solstice with bonfires and festive gatherings is called Yule. Yule traditions include lighting bonfires to symbolize the return of sunlight, celebrating with family, and exchanging gifts. Originating from ancient pagan customs, Yule focuses on themes of rebirth and renewal during the darkest time of the year. Festivities can include singing, dancing, and feasting, making it a time of joy and reflection for many cultures worldwide.