The Annunciation marks the event when the Archangel Gabriel revealed to the Virgin Mary that she would conceive and bear the Son of God, Jesus, marking the Incarnation.
The Feast of the Annunciation is a Solemnity, not a Holy Day of Obligation (although it was up until the 19th century), celebrated in the Roman Catholic Church on March 25 in most years. There is an exception when the day falls during the Easter Triduum, as is the case in 2026, when we celebrate the Feast of the Annunciation on April 8.
You can find the Basilica of the Annunciation in Nazareth, Israel.
Note: If March 25 falls during Holy Week or Easter Week, it is moved to the next available day, which is usually the Monday after the Second Sunday of Easter,