A ceasefire (also known as a truce), also spelled cease-fire (the antonym of 'open fire'), is a stoppage of a war in which each side agrees with the other to suspend aggressive actions, often due to mediation by a third party. Ceasefires may be between state actors or involve non-state actors.
Ceasefires may be declared as part of a formal treaty but also as part of an informal understanding between opposing forces. They may occur via mediation or otherwise as part of a peace process or be imposed by United Nations Security Council resolutions via Chapter VII of the United Nations Charter. A ceasefire can be temporary with an intended end date or may be intended to last indefinitely. A ceasefire is distinct from an armistice in that the armistice is a formal end to a war whereas a ceasefire may be a temporary stoppage.