It consists of providing information about an individual, usually without the latter's knowledge, often inspired by a motive contrary to morality or ethics and therefore ashamed (subjective).
Shot against an individual or a group of individuals, the denunciation is made by an informer, individual or group of people, for his own gain (to enrich himself and monopolize the property of others) or to harm him maliciously (jealousy , envy, hate). The function of informer can be created and paid by a power that seeks information against its opponents or enemies.
This form of treason and opportunism is recurrent in history and in many civilizations, for example through the image of the Roman usurper and his spies (secret agent) 3. From the point of view of strategy, it belongs to the modes of corruption. It can also manifest itself in the form of false testimony or slander4.
Popular language has produced a lexicon provided to designate the informer: "snitch", "balance", "donor", "indic", "poucave", "sycophant", "cockroach" and more broadly "collabo", " traitor "or" Judas ". wiki source