Body: "Psychological warfare" is the field of using psychology in order to gain something from an opponent without having to resort to physical violence by controlling their reactions.
Several topics in "Psychological warfare" include terrorism, psychological torture, propaganda.
A few notable experts of "Psychological warfare" include Charles Douglas Jackson, Adolf Hitler, Stephen Jolly.
People study "Psychological warfare" in order to learn how to defend their mind against attacks, learn how to wield propaganda effectively, avoid the need of direct war.