The Nativity of Our Lord, widely known as Christmas Day, is a major Christian festival celebrating the birth of Jesus of Nazareth. Commemorated annually on December 25, the holiday celebrates the incarnation—the belief that God took on human form in Jesus to bring redemption to the world. Rooted in both biblical accounts from the Gospels of Luke and Matthew, the day is marked worldwide by church services, festive gatherings, and the celebration of God's entry into human history.