psalm, psalms

Definition:

The term "psalm" refers to a sacred song, often in the form of a poem that was written to be sung.

The Old Testament Book of Psalms has a collection of these songs written by King David and other Israelites such as Moses, Solomon, and Asaph, among others.
The psalms were used by the nation of Israel in their worship of God.
Psalms can be used to express joy, faith, and reverence, as well as pain and sorrow.
In the New Testament, Christians are instructed to sing psalms to God as a way of worshiping him.