Inpatient care is a core concept within health services research and clinical practice analysis, referring to the provision of medical treatment or surgical intervention requiring a patient's admission and overnight stay in a hospital or specialized clinical facility. As an area of study, it investigates the organizational structures, care processes, patient outcomes, quality metrics, and resource utilization associated with this mode of healthcare delivery, underscoring its significance for evaluating system efficiency, patient safety, and the effectiveness of complex medical interventions.