Jesus is also called Jesus Christ.
Christmas or Christmas Day '' ' ( Crīstesmæsse , meaning `` Christ 's Mass '' ) is an annual festival commemorating the birth of Jesus Christ , observed most commonly on December 25 as a religious and cultural celebration among billions of people around the world . Jesus . His birth is celebrated annually on December 25 ( or various dates in January for some eastern churches ) as a holiday known as Christmas , his crucifixion is honored on Good Friday , and his resurrection is celebrated on Easter .