Christmas trees are called "Christmas trees" or "Yule trees" by some people, and they're traditionally used as decorations during the holiday season. They're typically evergreen conifers that symbolize eternal life, and they're often decorated with lights, ornaments, and other festive items. The tradition of bringing a tree into the home and decorating it dates back to the 16th century in Germany, and it became popular in other parts of Europe and North America in the 19th century. Today, Christmas trees are one of the most recognizable symbols of the holiday season.