Isaiah is a prophetic book that warns Judah about impending judgment due to their disobedience. It also offers hope, foretelling a future restoration and the coming of a righteous leader. The book is divided into two main sections: chapters 1-39 focus on warnings and judgment, while chapters 40-66 shift toward comfort and future redemption. Isaiah speaks against social injustice and idolatry, urging repentance. He also prophesies about a future era of peace where all nations will recognize divine rule. The book emphasizes that salvation is not just for Israel but for all people. Isaiah’s messages continue to influence religious and ethical thought today.