Psychological warfare (PSYWAR), or the basic aspects of modern psychological operations (PSYOP), have been known by many other names or terms, including Psy Ops, Political Warfare, “Hearts and Minds”, and Propaganda.[1] Various techniques are used, by any set of groups, and aimed to influence a target audience's value systems, belief systems, emotions, motives, reasoning, or behavior. It is used to induce confessions or reinforce attitudes and behaviors favorable to the originator's objectives, and are sometimes combined with black operations or false flag tactics. Target audiences can be governments, organizations, groups, and individuals.

In Propaganda: The Formation of Men's Attitudes, Jacques Ellul discusses psychological warfare as a common peace policy practice between nations as a form of indirect aggression in place of military aggression. This type of propaganda drains the public opinion of an opposing regime by stripping away its power on public opinion. This form of aggression is hard to defend against because no international court of justice is capable of protecting against psychological aggression since it cannot be legally adjudicated. The only defense is using the same means of psychological warfare. It is the burden of every government to defend its state against propaganda aggression. "Here the propagandists is dealing with a foreign adversary whose morale he seeks to destroy by psychological means so that the opponent begins to doubt the validity of his beliefs and actions."[2]