Peace is a state of harmony, the absence of hostility. This term is applied to describe a cessation of or lapse in violent international conflict; in this international context, peace is the opposite of war. Peace can also describe a relationship between any parties characterized by respect, justice, and goodwill.

More generally, peace can pertain to an individual relative to her or his environment, as peaceful can describe calm, serenity, and silence. This latter understanding of peace can also pertain to an individual's sense of himself or herself, as to be "at peace" with one's self would indicate the same serenity, calm, and equilibrium within oneself.