This chapter describes the three major approaches for changing risky behaviors namely policy, influencing individuals or families in a clinic-like setting, and population-based interventions. It explains the differences between the population-based tools of social marketing and community engagement. The chapter also describes the five groups of communities like rural villages and towns; worksites; schools; faith-based groups; and other groups. It discusses the some principles of community engagement. The chapter outlines the role of integration in comprehensive worksite wellness. A major role of active, engaged communities throughout history has been to support and encourage the health and well-being of community members. Public health must be willing to collaborate, partner, and strategize with key stakeholders to significantly meet the deficiency needs of communities during the community-building process. The main mission of public health is to provide primary population-based prevention services to prevent risk factors associated with disease and death.