The document defines health communication and outlines some of its key characteristics and roles. Health communication is defined as the study and use of strategies to inform and influence health decisions. It is audience-centered, research-based, and aimed at behavioral or social change. In the private sector, health communication strategies are used as part of marketing to support product adoption or endorsement of health issues. The scope of health communication in public health includes disease prevention, health promotion, healthcare policy, and enhancing community health and quality of life.