The Chaplet of the Divine Mercy is a Christian devotion, based on the visions of Jesus reported by Saint Mary Faustina Kowalska (1905–1938), known as "the Apostle of Mercy." She was a Polish sister of the Congregation of the Sisters of Our Lady of Mercy and canonized as a Catholic saint in 2000.
Faustina stated that she received the prayer through visions and conversations with Jesus, who made specific promises regarding the recitation of the prayers] Her Vatican biography quotes some of these conversations
As a Roman Catholic devotion, the chaplet is often said as a rosary-based prayer with the same set of rosary beads used for reciting the Holy Rosary or the Chaplet of Holy Wounds, in the Roman Catholic Church.
Pope John Paul II was instrumental in the formal establishment of the Divine Mercy devotion and acknowledged the efforts of the Marian Fathers in its promotion in a Papal Blessing in 2001, the 70th anniversary of the revelation of the Divine Mercy Message and Devotion. Although the prayers said on the beads of the rosary chain share specific similarities between the Chaplet of Divine Mercy and the Chaplet of Holy Wounds, these are distinct chaplets and were introduced over 20 years apart, one in Poland, the other in France.
The chaplet in normally said at 3.00 noon and repeated over a period of nine days as part of a novena. According to Faustina's words, Jesus himself in a vision asked to pray the Divine Mercy Novena as a preparation for the Feast of the Divine Mercy, celebrated each year on 1st Sunday after Easter.