Public relations can take several forms from one-way communication models like publicity that disseminate information to propaganda, to two-way symmetric models that aim for mutual understanding. The publicity model is less controlled and focuses on disseminating information through outlets like press releases, while the two-way symmetric model allows for a balanced exchange between groups to develop understanding. Effective public relations considers the target audience, uses appropriate media, and crafts messages that are clear, concise and easily understood to maintain media interest and readership.