Community engagement can take many forms, and partners can include organized groups, agencies, institutions, or individuals. Collaborators may be engaged in health promotion, research, or policymaking.

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Community engagement can also be seen as a continuum of community involvement. Most notably, while community engagement may be achieved during a time-limited project, it frequently involves — and often evolves into — long-term partnerships that move from the traditional focus on a single health issue to address a range of social, economic, political, and environmental factors that affect health.

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Reference: https://www.atsdr.cdc.gov/communityengagement/pce_what.html