Divine Mercy devotion is a form of Catholic spirituality centered on the mercy of God as revealed through Jesus Christ. It emphasizes God's love and forgiveness, encouraging believers to trust in His mercy and extend compassion to others. The devotion is particularly associated with the Diary of Saint Faustina Kowalska, a Polish nun who reported visions of Jesus and His message of mercy in the early 20th century. Key practices of Divine Mercy devotion include the Divine Mercy Chaplet, a prayer recited using rosary beads, and the celebration of Divine Mercy Sunday, observed on the Sunday after Easter. These practices aim to deepen faith and promote a spirit of reconciliation and charity among individuals.