Question: what are the different division of the psalms?
Answer: The Book of Psalms is divided into five sections, each closing with a doxology (i.e., a benediction)—these divisions were probably introduced by the final editors to imitate the five-fold division of the Torah: Book 1 (Psalms 1–41) Book 2 (Psalms 42–72) Book 3 (Psalms 73–89)