Christmas trees come in a variety of sizes and shapes, but the most popular type of tree for Christmas is the pine tree. Pine trees are a coniferous tree, meaning they have needles instead of leaves. They're also evergreen, which means they keep their needles year-round. Pine trees are known for their strong scent, and they have a dense, full shape that makes them perfect for decorating with lights and ornaments. Some other popular Christmas trees include fir trees, spruce trees, and cedar trees.