Stotras are a type of popular devotional literature and are not bound by the strict rules as some other Hindu scriptures, such as the Vedas. They are accessible by the everyday householder.
One type of stotra is based on chanting a litany of names for a deity. A category of stotra of that type is the Sahasranama, which is a litany of a thousand names for a particular deity. Sahasranama means "1000 names"; Sahasra means 1000 and nama means names. For example, Vishnu Sahasranama means 1000 names of Vishnu. According to Hinduism, the names of God are valuable tools for devotion.