What is Rosaries

One of the colleagues asks me that what are rosaries? She saw this name online but wasn't understand what this word mean, not surprise that she doesn't know what is rosaries because she not a catholic. I just explain to her rosaries is a set of prayer beads, similar to Buddhist prayer beads, and a system of set prayers to be said as the beads are told. And also send her some web site URL which selling beautiful rosaries. So that she will know what is rosaries now.