The document compares different types of campaigns, their target audiences, techniques used, and effectiveness. It discusses commercial campaigns aimed at broad audiences using TV, posters and broadcasts. Charity campaigns also target broad audiences but are very effective in raising money and awareness through posters, ads, and TV special events. Pressure groups may focus on specific audiences like government officials and use techniques like protests to get their points across effectively. Political campaigns have varying target audiences but use meetings, surveys, voting and media to engage constituencies and promote their goals.