The purpose of 2 Samuel is to chronicle the reign of David as the king of Israel and to show his rise to power and consolidation of the kingdom through military conquests. The book also explores David’s personal life, including his relationships with his wives and children, and his friendship with Jonathan. The story of David and Bathsheba, as well as his struggles with his own family and court officials, are also recounted. Ultimately, the book emphasizes that David’s reign was a result of God’s covenant promises to his chosen people, and the establishment of the Davidic Covenant ensured that David’s line would produce a forever king.