Pagans celebrate Yule a holiday that takes place during the Winter Solstice, usually just a few days before Christians celebrate Christmas. The two holidays have similarities since Christmas is rooted in both the Germanic Yule, as well as the Roman Saturnalia.
Many modern Christmas traditions are based on pagan Yuletide celebrations. For example, pagans would traditionally decorate an evergreen tree to celebrate the winter solstice. This influenced the decorating of Christmas trees.