The tradition of decorating a Christmas tree with lights and ornaments is believed to have originated in Germany in the 16th century. The German people would bring trees into their homes during the winter solstice, as a symbol of the coming of spring and the promise of new life. The trees would be decorated with apples, nuts, and candles to symbolize the abundance of the harvest and the light of the sun. Over time, the tradition spread to other parts of Europe and eventually to the United States, where it became a beloved Christmas tradition.