Healthcare refers to the prevention, diagnosis and treatment of illnesses, as well as the promotion of health through the provision of medical services by trained professionals. It involves a wide range of services provided by physicians, nurses, pharmacists, and other health care providers, including not only hospital care but also primary care such as doctor visits, immunizations, and screening tests. The goal of healthcare is to improve the overall well-being of individuals and communities through prevention, early intervention, and treatment of illnesses, as well as by promoting healthy lifestyles and behaviors.