The "Mysteries of the Rosary" are a set of meditations that guide Catholics in prayer while using the Rosary, a string of beads. There are four main categories of mysteries: the Joyful Mysteries, Sorrowful Mysteries, Glorious Mysteries, and Luminous Mysteries. Each category contains five specific events from the life of Jesus Christ and the Virgin Mary that believers reflect upon during prayer. Praying the Rosary involves reciting specific prayers, such as the Our Father and Hail Mary, while meditating on each mystery. This practice helps deepen one's faith and understanding of key moments in Christianity, fostering a closer relationship with God.