The tradition of Christmas trees can be traced back to the 16th century in Germany. At the time, people would bring evergreen trees into their homes during the winter months to symbolize everlasting life. The tradition then spread to other parts of Europe and eventually to the United States. Over time, people began to decorate the trees with lights and ornaments as a way to celebrate the season. Today, Christmas trees are a beloved part of the holiday season and are enjoyed by people around the world.