In the Genesis flood narrative, Noah sends out a dove to test whether the waters have receded. Genesis 8 describes three releases of the dove, each providing information about the condition of the land.
The first dove returns because it finds no resting place. A later release produces a fresh olive leaf, showing that vegetation has appeared above the waters. When Noah sends the dove again, it does not return, signaling that the land is becoming habitable.
The dove test comes after Noah first sends a raven, so the two birds have different roles. The olive leaf has become a widely recognized emblem of peace, but in the passage its immediate narrative purpose is practical: it tells Noah that the Flood is receding and plant life is available.