Healthcare is delivered by health professionals (providers or practitioners) in allied health professions, chiropractic, physicians, physician associates, dentistry, midwifery, nursing, medicine, optometry, audiology, pharmacy, psychology, and other health professions. It includes the work done in providing primary care, secondary care, and tertiary care, as well as in public health.
Primary health care
Primary care refers to the work of health professionals who act as a first point of consultation for all patients within the health care system.
Secondary health care
Secondary care includes acute care: necessary treatment for a short period of time for a brief but serious illness, injury or other health condition, such as in a hospital emergency department.
Tertiary health care
Tertiary care is specialized consultative health care, usually for inpatients and on referral from a primary or secondary health professional .
Health care industry
The health care industry incorporates several sectors that are dedicated to providing health care services and products.
Health care research
The quantity and quality of many health care interventions are improved through the results of science, such as advanced through the medical model of health
Health care financing
In most countries, the financing of health care services features a mix of all five models, but the exact distribution varies across countries and over time within countries.
Health information technology
Health information technology (HIT) is "the application of information processing involving both computer hardware and software that deals with the storage, retrieval, sharing, and use of health care information, data, and knowledge for communication and decision making."
Technology is a broad concept that deals with a species' usage and knowledge of tools and crafts, and how it affects a species' ability to control and adapt to its environment.