Christmas is called Christmas because it celebrates the birth of Jesus Christ, the central figure of the Christian faith. It is derived from the Old English term "Cristes maesse", which means "Christ's Mass". The term "Mass" refers to the celebration of the Eucharist, which is a Christian ritual that commemorates the Last Supper of Jesus and his followers. In modern times, Christmas is celebrated as a religious and cultural holiday, with traditions such as gift-giving, decorating trees, and spending time with family.