This document provides an overview of international humanitarian law (IHL) including its philosophy, fundamental principles, and inherent limits. It discusses IHL's goal of limiting violence in armed conflict by sparing non-combatants and restricting violence to only what is necessary to achieve military objectives. The fundamental principles of distinction, prohibitions on attacking hors de combat individuals, unnecessary suffering, military necessity, proportionality, precaution, and humanity are explained in detail. The document also notes some inherent limits of IHL and argues that while legal regulation cannot prohibit war, establishing minimum respected rules through IHL is important given the reality of armed conflicts.