Primary health care is defined as essential care that is universally accessible, affordable, and acceptable to all people. It has several key elements including education on health issues, nutrition promotion, water and sanitation, maternal and child care, immunization, treatment of common diseases, and provision of essential drugs. The principles of primary health care are that it uses appropriate technology that can be maintained locally, coordinates between different community sectors, encourages community participation, and distributes health services equitably among all people.