The tradition of decorating a Christmas tree on Christmas Eve is a time-honored tradition that originated in Germany in the 16th century. It was believed that the evergreen tree symbolized eternal life, and the Christmas tree itself was meant to serve as a reminder of the birth of Jesus Christ. The custom of decorating the tree with lights and ornaments came later, and it was not until the 19th century that the tradition of putting presents under the tree was established. Today, the Christmas tree remains a beloved symbol of the holiday season.