Advent is a season observed in most Christian denominations as a time of expectant waiting and preparation for both the celebration of the Nativity of Christ at Christmas and the return of Christ at the Second Coming. Advent is the beginning of the liturgical year in Western Christianity. The name was adopted from Latin adventus "coming; arrival", translating Greek parousia from the New Testament, originally referring to the Second Coming.

The nativity of Jesus, nativity of Christ, birth of Jesus or birth of Christ is documented in the biblical gospels of Luke and Matthew. The two accounts agree that Jesus was born in Bethlehem, Judaea, that his mother, Mary, was engaged to a man named Joseph, who was descended from King David and was not his biological father, and that his birth was caused by divine intervention. Some scholars do not see the two canonical gospel nativity stories as historically factual since they present clashing accounts and irreconcilable genealogies. The secular history of the time does not synchronize with the narratives of the birth and early childhood of Jesus in the two gospels. Some view the question of historicity as secondary, given that gospels were primarily written as theological documents rather than chronological timelines.