The Chaplet of Divine Mercy is a Christian prayer that focuses on God's mercy and compassion. It was revealed to Saint Faustina Kowalska, a Polish nun, in the 1930s. The chaplet is typically prayed using a standard rosary and consists of specific prayers, including the Our Father, Hail Mary, and the Jesus Prayer, repeated in a particular sequence. This devotion is often recited at 3 PM, known as the Hour of Mercy, commemorating the time of Christ's death. The chaplet emphasizes the importance of trust in God's mercy and is a popular practice among Catholics, especially during the Divine Mercy Sunday celebration.