This paper discusses, in a preliminary manner, what revengeis. (It does not address the rationality or moral standing of revenge.) In particular, it proposes four elements of revenge —an agent, a recipient, a harm intended by the former, and a harm done by the latter which provokes the revenge. Based on these four elements, it highlights both agent-internal conditions forgetting revenge, and agent external ones. Along the way, the paper contrasts revenge with related phenomena like merely getting even, and retribution.