A Christmas tree is a decorated evergreen coniferous tree that is an important part of the Christmas holiday celebrations. It is typically a symbol of the holiday season, and is commonly used as a centerpiece for a Christmas display or a Christmas tree farm. The most common Christmas trees are fir, spruce, and pine trees. They are typically decorated with lights, ornaments, and other decorations to give them a festive and cheerful look. Some people also have artificial Christmas trees, which are made of plastic or other materials and can be used year after year.