A Christmas tree refers to an evergreen tree decorated with fir trees or pine trees with lights and decorations. As one of the important elements of Christmas, the modern Christmas tree originated in Germany and later gradually became popular around the world, becoming one of the most famous traditions in Christmas celebrations. It is said that the Christmas tree first appeared in the so-called Saturnalia in mid-December in ancient Rome. Nowadays it is common for people to bring an evergreen plant such as a pine tree indoors or outdoors around Christmas and decorate it with Christmas lights and colorful decorations. And place an angel or star on top of the tree.