why is christmas celebrated on december 25

Well, the true origin of Christmas is not entirely clear. But it is believed that the date was chosen to commemorate the birth of Jesus Christ, who is considered by many to be the central figure of Christianity. The date is also associated with several other events, including the pagan festivals of Saturnalia and the Yule celebration. So, while the exact reason for December 25th being chosen is unknown, it has become a widely recognized and celebrated holiday.