This document defines a hospital and classifies hospitals. It discusses the key functions of a hospital which include patient care, health personnel education, health promotion, and health-related research. Hospitals are classified based on service type, ownership, length of stay, staffing structure, and bed capacity. The document also outlines the major departments in a hospital, separating them into professional health services departments and non-professional health services departments. Some of the major departments listed include medical, nursing, outpatient, emergency, operating theatre, administration, and housekeeping.