Propaganda is systems designed to influence and inspire persons, the populous; promoting/publishing and popularizing ideas, usually political, toward a cause. The "science" originated through an American Psychologist, Edward Bernays, as public relations to include publications such as, Crystallizing Public Opinion (1923) and Propaganda (1928). Goebbels of the Nazi party used these publications in the design of Nazi systems of the 1930's.
Here is an Introduction to Propaganda,
Introduction - Propaganda
Deception and propaganda go hand in glove; that deception is at the core of these systems, aimed influence and inspire persons into action (or inaction) but finally and always to control a collective. These systems or mechanisms are part and parcel for war, aimed to foment action through fears, but also used for commercial purposes (advertising/marketing) and even among persons, one to the other but always for the purpose of control/power--in this last case, to manipulate or persuade, rather than force, action. One may even so far as to appear sorry or apologetic if they think this will persuade those they aim to control of the worthiness of the matter, mission.
I mention that many in Nazi Germany would persuaded or convinced on the premise or experience that the Nazi party helped them out of economic depression, dire unemployment and despair. To learn more about why the German people followed their fuhrer because he(they) provided jobs. To learn more about this situation read They Though They
Were Free, Milton Mayer. Here is a summary:
First published in 1955, They Thought They Were Free is an eloquent and provocative examination of the development of fascism in Germany. Mayer’s book is a study of ten Germans and their lives from 1933-45, based on interviews he conducted after the war when he lived in Germany. .