Propaganda is a powerful tool used by certain groups in order to influence public opinion. propaganda generally has a negative connotation to it, because it implies that someone is trying to manipulate the way you think. advertisers use propaganda every day to try to sell their products. politicians thrive on the use of propaganda. Whatever the purpose, it can be highly effective when utilized correctly. On this site, you will learn about the various forms of propaganda and see some real-life images with examples of each of the seven types.