Oh, that's a very good question! The tradition of decorating a Christmas tree began in Germany in the 1500s. People would bring an evergreen tree indoors and decorate it with apples, nuts, and small candles. It was believed that the evergreen tree symbolized eternal life and the light of the candles represented the light of Christ. Today, we decorate our trees with many different ornaments and lights to symbolize the joy and beauty of the holiday season.