Health care refers to the complex system of practices, services, and sciences dedicated to preventing, diagnosing, and treating illness and injury. From a scientific perspective, it integrates disciplines such as biomedicine, microbiology, chemistry, and engineering to develop therapeutic interventions and diagnostic tools. Core components include public health measures, which focus on population-level preventative strategies; acute care, involving immediate treatment of illness; and chronic care, dedicated to managing long-term physiological conditions. The field continuously advances through research into molecular biology and drug development, aiming to restore or maintain optimal bodily function and promote overall well-being.