A "Psalm" is a sacred song or poem found in the Bible, specifically in the Book of Psalms. This collection consists of 150 individual psalms that express a range of emotions, including praise, lament, thanksgiving, and supplication. Traditionally attributed to figures like King David, these writings are used in both personal and communal worship. Psalms are often recited or sung in religious services and are significant in both Judaism and Christianity. They serve as a means of communication with God, reflecting the spiritual struggles and joys of believers throughout history.