"Christmas" is the name of the Christ "mass" of the acronym. A Mass of the Church liturgy. Christmas is a religious festival. We regard it as the birth of Jesus to celebrate, thus also known as Christmas. On this day, all the Christian world will have to hold a special prayer ceremony. But there are many Christmas celebrations do not have the slightest association and religion. Exchange gifts, send cards, which have become a Christmas to celebrate the day.Christmas is the world's largest Christian festival. 4 beginning of the century, January 6 is the eastern part of the Roman Empire that Su Memorial Church of the Nativity and baptized the double festival, known as the "Epiphany" Epiphany, also known as "Epiphany" that the world of God through the Su himself. At that time, only the cold Church Road widening exception, where only commemorate the birth of Jesus rather than the Su commemorate the baptism. Later historians study in Rome with the Christian calendar found in 354 AD, December 25 pages in the record: "Christ's birth in Bethlehem of Judea." After the study, generally considered on December 25 for Christmas may start with in 336 AD, the Roman Church), in about 375 AD in Asia Minor spread of Antioch, AD 430, spread to the Adriatic in Alexandria, Egypt, then spread cold Church Road accepted in the latest, and the Armenian Church is still persist January 6 Epiphany is that the Su birth. December 25 is the original Persian Ra (bright god) Mithra (Mithra) birthday is a holiday infidels, and Titan is one of the Roman gods, goddesses of the country. This is the day the Roman calendar of the Winter Solstice Festival, the worship of the sun god are infidels this spring day as the hope of reviving everything start. May be due to this reason that the Roman Church before choosing this day as Christmas. This is the church initially tried to Christian pagan customs of one of the measures. Later, while most churches have accepted December 25 for Christmas, but throughout the church-the different calendar used by a specific date can not be uniform, so put December 24 to the second year of the January 6 scheduled for Christmas Festival period (Christmas Tide), can be based on local churches around the specific circumstances during the period of the festival to celebrate Christmas. Since December 25 churches recognized by the majority after Christmas, the original January 6 on the Epiphany only to commemorate the baptism of Jesus, but the Catholic Church again on January 6 as a "three-section to the North Korea" to Memorial Health Jesus, the East-three (3-) to the story of a pilgrimage. With the spread of Christianity, Christmas had become a Christian sects, the masses and the masses of non-Christians an important festival. Many countries in Europe and the United States, people attach great importance to this festival, and it linked to the New Year, and the festive celebrations and grand greatly exceeded the New Year, become a national holiday. December 25 with the main commemoration of the birth of the legend of the Su.