This document discusses mass communication and its role in society. It describes mass communication as focusing on the content of information disseminated to a diverse audience through various media, unlike interpersonal communication which has a single source. The major fields of mass communication are outlined as journalism, broadcasting, advertising, and public relations. The objectives and functions of mass communication are also summarized, including to inform, raise public opinion, entertain, and act as gatekeepers. The document emphasizes that mass communication plays a fundamental role in society by influencing politics, social issues, education, and more.