Jus In Bello refers to the set of legal and ethical rules that govern the conduct of armed conflict. It is part of international humanitarian law and focuses on how wars should be fought, ensuring that combatants and non-combatants are treated humanely. The principles aim to limit the effects of armed conflict for humanitarian reasons. Key principles of Jus In Bello include distinction, proportionality, and necessity. Distinction requires parties to differentiate between military targets and civilians. Proportionality ensures that the harm caused to civilians is not excessive in relation to the military advantage gained. Necessity mandates that force used in conflict must be essential to achieve a legitimate military objective.