How are the Wisdom and Poetry Books different from the rest of the writings of the Old Testament?

The Ketuvim consist of religious poetry and wisdom literature—Psalms, Proverbs, and Job, a collection known as the Five Megillot (Five Scrolls; i.e., Song of Songs, Ruth, Lamentations, Ecclesiastes, and Esther, which have been grouped together according to the annual cycle of their public reading in the synagogue)—and