1. PSA and commercials are all the services that help people to introduce their products or tell other people what to do. Between PSA and commercials, they have many different things. PSA have a lot of talk and usually work for radio; in fact good commercial has less talk in has moving picture to show their products...
2. Also when people make PSA or commercial they need to make it memorable, There are many ways to make it memorable: humor, famous people, fear...
3. music, humor
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