This document provides an overview of key concepts in community and public health nursing. It defines a community as a group interacting in social units and sharing common interests. Public health is described as having three core functions: assessment, policy development, and assurance. The three levels of prevention are also discussed: primary prevention aims to prevent problems before they occur through health promotion; secondary prevention focuses on early detection and treatment; and tertiary prevention aims to limit disability and promote rehabilitation. Community health assessments and the nursing process are described as important tools. Historical changes in major health problems from acute to chronic diseases are also noted.