Christmas is an annual holiday that celebrates the birth of Jesus. Christmas festivities often combine the commemoration of Jesus’ birth with various secular customs, many of which have been influenced by earlier winter festivals. The date of the celebration is traditional but it is not considered to be his actual date of birth.
In most countries around the world, Christmas Day is celebrated on December 25. Christmas Eve is the preceding day, December 24.
The word “Christmas” is a contraction of two words “Christ’s mass” and is derived from the Middle English Christemasse and Old English Cristes mæsse, a phrase first recorded in 1038. In early Greek versions of the New Testament, the letter Χ (chi), is the first letter of Christ (Χριστός). Since the mid-16th century Χ, or the similar Roman letter X, was used as an abbreviation for Christ. Thus, Xmas is an abbreviation for Christmas.
The prominence of Christmas Day increased gradually after Charlemagne was crowned on Christmas Day in 800. Around the 12th century, the remnants of the former Saturnalian traditions of the Romans were transferred to the Twelve Days of Christmas (26 December – 6 January). Christmas during the Middle Ages was a public festival, incorporating ivy, holly, and other evergreens, as well as gift-giving.
Modern traditions have come to include the display of Nativity scenes, Holly and Christmas trees, the exchange of gifts and cards, and the arrival of Father Christmas or Santa Claus on Christmas Eve or Christmas morning. Popular Christmas themes include the promotion of goodwill and peace.
Ref: wikipedia.com