The Prophets was the name given by the Bajorans to the non-corporeal, non-linear beings that resided in the Bajoran wormhole (referred to as the Celestial Temple by the Bajorans). The Bajorans saw the Prophets as gods, while other species referred to them simply as the "wormhole aliens".
In 2374, the Prophets made an entire fleet of Dominion warships disappear within the wormhole as they made their transit from the Gamma Quadrant to the Alpha Quadrant. It was rumoured that they were also blocking subsequent attempts by the Dominion from reinforcing their forces in the Alpha Quadrant.
After Jake destroyed the Reckoning Tablet he freed a Prophet and the Kosst Amojan. The Prophet sought Kira Nerys as its instrument for the battle. AFter Kira's death it accepted Jake Sisko as its instrument and engaged a possessed Dukat in battle. The Prophet was victorious, defeating Dukat.
With their victory in the Reckoning the Prophets "sealed the fate" of the Pah-wraiths. At the same time they transported all those who were of Bajor to the Celestial Temple for the rebirth of Bajor.