A war between belligerents whose relative military power differs significantly, or whose strategy or tactics differs significantly. Asymmetric warfare can describe a conflict in which the resources of two belligerents differ in essence and in the struggle, interact and attempt to exploit each other’s characteristic weaknesses. Such struggles often involve strategies and tactics of unconventional warfare, the weaker combatants attempting to use strategy to offset deficiencies in quantity or quality. Such strategies may not necessarily be militarized. This is in contrast to symmetric warfare, where two powers have similar military power and resources and rely on tactics that are similar overall, differing only in detail and execution. The term is frequently used to describe what is also called guerrilla warfare, insurgency, terrorism, counterinsurgency and counterterrorism, essentially violent conflict between a formal military and an informal, less equipped and supported, undermanned but resilient opponent.