The concept of propaganda is widely misunderstood. Many people automatically assume that it's a negative thing. But propaganda is just a tool that can be used for either good or bad. Propaganda involves bypassing the intellect and appealing directly to emotion to motivate a group of people to action. During the World Wars, time was of the essence and masses of people needed to work together for the common goal of defending the nation. It would have been too slow to talk each and every move out with the whole population, so governments used powerful imagery to bring everyone together in the war effort.