Many of the Bible's books have poetic elements, but the books of Job, the Psalms, the Proverbs, Ecclesiastes, and the Song of Solomon are written explicitly as poetry. Each uses powerful poetic language to express its concern with human nature and the relationship man has with God.
Job tells the story of a good man whose faith in God is tested as his prosperity, his family and his health are taken from him. In the Psalms, King David sings of joy and sorrow, terror and triumph, always returning to God, the author of it all.
In the Song of Solomon, King Solomon expresses the delights of physical love. In the Proverbs, he collects the wisdom of his people in a series of meditations. In Ecclesiastes, he looks back upon life as one who had everything and calls it "vanity and grasping after the wind," affirming the necessity of faith in God.