A rosary is a necklace with beads
A rosary is used in the Rosary prayer: With every bead you pray a Our father or Hail Mary and think about important events from the life of Jesus and Mary. The Rosary (also called prayer cord or paternoster) is used in the Catholic Church and consists of 5 large and 50 small beads. Every time a Hail Mary is prayed, Maria gives a beautiful rose: a complete rosary is a crown of roses for her.