Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on 25 December as a religious and cultural celebration among billions of people around the world. A liturgical feast central to Christianity, preparation for Christmas begins on the First Sunday of Advent and it is followed by Christmastide, which historically in the West lasts twelve days and culminates on Twelfth Night.
https://en.wikipedia.org/wiki/Christmas
Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on 25 December as a religious and cultural celebration among billions of people around the world. A liturgical feast central to Christianity, preparation for Christmas begins on the First Sunday of Advent and it is followed by Christmastide, which historically in the West lasts twelve days and culminates on Twelfth Night.
