Ordinary persuasion tries to win you over. Propaganda tries to manage you at scale.
What separates propaganda from everyday argument or advertising isn’t the presence of bias — it’s organisation and intent. The term describes a deliberate, systematic campaign to shape what a population believes or feels, using symbols, framing, and repetition rather than open, falsifiable argument, run by an institution (a state, a party, a movement) with a specific outcome in mind.
The 20th century’s founding theoretical treatment of the subject, developed against the backdrop of the first World War’s mass mobilisation and the growth of modern mass media, defined propaganda specifically as symbol-management directed at collective attitudes — a definition that still holds up against most of what circulates through modern advertising and political messaging, whether or not the audience recognises it as such.
Source: Lasswell, H.D. (1927). “The Theory of Political Propaganda.” American Political Science Review, 21(3), 627–631.