Psalm

...Thus the psalms were gradually collected into the five books of the Psalter (or "Praises"), the masterwork of prayer in the Old Testament.

2586 The Psalms both nourished and expressed the prayer of the People of God gathered during the great feasts at Jerusalem and each Sabbath in the synagogues. Their prayer is inseparably personal and communal; it concerns both those who are praying and all men. The Psalms arose from the communities of the Holy Land and the Diaspora, but embrace all creation. Their prayer recalls the saving events of the past, yet extends into the future, even to the end of history; it commemorates the promises God has already kept, and awaits the Messiah who will fulfill them definitively. Prayed by Christ and fulfilled in him, the Psalms remain essential to the prayer of the Church.38
The Catechism of the Catholic Church, Part Four, Section 1, Chapter 1