Public relations is defined as a planned and sustained effort to establish mutual understanding between an organization and its publics. It involves influencing public opinion through sound character and two-way communication to gain cooperation and support. Integrated marketing communications coordinates various marketing activities including PR, advertising, and sales promotion. PR differs from advertising in its use of varied tools to target specialized audiences rather than mass media to reach external audiences. PR plays a supporting role while advertising is a communication function. Careers in PR require strong writing, research, planning, problem-solving, and business skills.