It's a tradition to decorate a Christmas tree with ornaments, lights, and other decorations to symbolize the joy and beauty of the holiday season. The tree represents the evergreen that is a symbol of life, and the decorations represent the gifts and joys of Christmas. The tree is usually placed in the center of the room, and is decorated with a variety of ornaments, lights, and other decorations. Some of the most popular ornaments are red and green balls, lights, garlands, and other decorations. These decorations add to the beauty and joy of the holiday season.