Christmas is a Christian holiday that celebrates the birth of Jesus Christ.No one knows the exact date of Christ's birth,but most Christians observe Christmas on December 25.On this day,many go to church,where they take part in special religious services.During the Christmas season,they also exchange gifts and decorate their homes with holly,mistletoe,and Christmas trees.The word Christmas comes from Cristes maesse,an early English phrase that means Mass of Christ.The story of Christmas comes chiefly from the Gospels of Saint Luke and Saint Matthew in the New Testament.