Propaganda is a form of communication to distribute information. It is usually biased. The information is designed to make people feel a certain way or to believe a certain thing. The information is often political.
Often, propaganda is confusing and unfair, which makes it hard to tell whether the information is true or false. Propaganda tends to make disputes last longer and be more difficult to resolve. It can take the form of posters, TV advertisements, and radio announcements.
The word 'propaganda' comes from Latin. At first, it meant 'ideas to be spread around'. But in the First World War, it came to mean political ideas that are supposed to be misleading.
Propaganda is like advertising in some ways. For example, it uses the mass media to spread its ideas. But advertising is usually trying to sell something, whereas propaganda is about ideas. It is often political, and used by states or political parties, not private companies.