Jesus "Christ" is known as the founder or central figure of "Christianity." Christmas is a Christian holiday on December 25 that commemorates the birth of Jesus. Ancient Romans also commemorated Jesus' birth by marking a division of the calendar still in use today. The years before Jesus' birth are marked as B.C. (Before Christ), and the years after Jesus' birth are marked A.D. (Anno Domini, which means, in the year of our Lord).
Christmas literally means the Mass (celebration) of Christ. "Christ" is a Greek word and title, meaning "anointed" or one set apart by God for a special purpose. "Christ" is equivalent to the Hebrew word "Messiah." Based on the words of ancient prophets, the first century Jewish people expected the arrival of the Messiah promised by God as a great deliver of the people.