Just war theory

Just War Theory is a set of ideas that helps us decide if going to war is the right thing to do. It's a set of rules that try to make sure that any wars are fought fairly, and only when we really need to. In other words, it's like a set of rules that explains how and why wars can be fought. The main parts of Just War Theory are that wars should only be fought if they are necessary; they should only be fought if they will make things better in the long-term; and they should never be fought just for fun or revenge.