The Christmas tree tradition has its roots in the pagan festival of Yule, which was celebrated in ancient Europe during the winter solstice. The evergreen tree was considered a symbol of life and rebirth during this time of year, when the days were short and the weather was cold. During the Middle Ages, Christians began to use the evergreen tree to symbolize the birth of Jesus and the eternal life he brings. Over time, the Christmas tree tradition evolved, with the addition of lights, ornaments, and other decorations to represent the joy and hope of the season.