why is christmas celebrated on 25 december

Christmas is celebrated on December 25th to commemorate the birth of Jesus Christ, who is considered to be the son of God in Christian belief. The date of December 25th was chosen as the date of his birth because it is believed to be the day when he was conceived by his mother, Mary. Christmas has become a secular holiday in many parts of the world and is celebrated as a time of joy, family, and giving.