The origins of Christmas can be traced back to a pagan holiday called Yule, which was celebrated by the ancient Germanic peoples in northern Europe. The holiday was marked by the winter solstice, the shortest day of the year, and was a time of feasting, gift-giving, and celebrating the return of the sun. In the fourth century AD, the Christian Church adopted the holiday as a way to celebrate the birth of Jesus Christ. This is why we celebrate Christmas on December 25th.