Propaganda is used by governments to persuade people to agree with a policy or do something that governments are trying to make them (the populace) either agree with or act the correct way.
I always like to tell the story about the BBC in WWII. They used their news broadcasts in rather an odd way. They told the truth. Just as it happened. Especially when they were losing. It was disheartening for the people at home, but it was still great Propaganda.
When the war started to turn against Germany, the BBC still told the truth. That way the German people knew who to listen to. It was a great result.
