Feast of Our Lady of the Rosary
There's nothing I can add about the origins of the Rosary that isn't already extensively documented. I can only say that, to me, praying the Rosary is witnessing the mystery of our salvation by Jesus through Mary's eyes. Mother Mary extends her hand to me and she leads me through her Son's life, death and resurrection.
But I have to confess that I hold Mary's hand as a bratt with a very short attention span, yet she never fails to offer her hand to me again after I let go of it. She invites me to ponder these misteries in my heart, as she herself did (Lk 2:19), so that I grow in love for her Son, Christ Jesus.