The concept of "Just War" refers to a doctrine that outlines the conditions under which a war can be morally justified. It is rooted in ethical considerations and aims to ensure that warfare is conducted for the right reasons, such as self-defense or protecting innocent lives. The principles of Just War theory include legitimate authority, just cause, right intention, and proportionality. Additionally, the Just War theory is divided into two main categories: jus ad bellum, which addresses the justification for entering a war, and jus in bello, which focuses on the conduct of war. These principles help guide nations and leaders in making ethical decisions regarding military action.