The WHO defines community health as the environmental, social, and economic resources to sustain emotional and physical well-being among people in ways that advance their aspirations and satisfy their needs in their unique environment.
It is a branch of public health that focuses on people and their role as determinants of their own and other people’s health. This is in contrast to environmental health, which focuses on the physical environment and its impact on people’s health.
It is a major field of study within the medical and clinical sciences that focuses on the maintenance, protection, and improvement of the health status of population groups and communities.

Medical interventions that occur in communities can be classified in three categories: each focuses on a different level and approach toward the community or population group:
Primary health care. Primary health care programs aim to reduce risk factors and increase health promotion and prevention.
Secondary health care. Secondary health care, also called "hospital care," is where acute care is administered in a hospital setting.
Tertiary health care. Tertiary health care refers to highly specialized care usually involving disease or disability management.

See reference for more information.

Adapted from Wikipedia, the free encyclopedia. Internet. Accessed on January 12, 2020.