Christmas trees are a type of evergreen tree, typically conifers, that are used as a festive decoration during the holiday season. These trees are native to the Northern Hemisphere and have been used as a traditional part of Christmas celebrations for centuries. The most common species of Christmas trees include the Norway Spruce, the Fraser Fir, the Balsam Fir, the Douglas Fir, and the Scotch Pine. These trees are known for their lush, green foliage and their ability to retain their needles for extended periods of time, making them ideal for decorating and displaying in homes during the holiday season.