The book of Job is Narrative History. Its author is unknown yet it is possible that Job himself wrote it. It is possible that Job is the oldest of any book of the Bible written approximately 2100-1800 B.C. Key personalities of this book include Job, Eliphaz the Temanite, Bildad the Shuhite, Zophar the Naamathite, and Elihu the Buzite.
In Job, we see a man who God allows to be directly attacked by Satan. He is an example of faithfulness as he loses everything important to him yet remains faithful to God. Its purpose is to illustrate God's sovereignty and faithfulness during a time of great suffering.