Hospital, an institution that is built, staffed, and equipped for the diagnosis of disease; for the treatment, both medical and surgical, of the sick and the injured; and for their housing during this process. The modern hospital also often serves as a center for investigation and for teaching. To better serve the wide-ranging needs of the community, the modern hospital has often developed outpatient facilities, as well as emergency, psychiatric, and rehabilitation services. Hospitals have long existed in most countries. Developing countries, which contain a large proportion of the world’s population, generally do not have enough hospitals, equipment, and trained staff to handle the volume of persons who need care. Thus, people in these countries do not always receive the benefits of modern medicine, public health measures, or hospital care, and they generally have lower life expectancies. Hospital is a kind of institution which deals with health care activities that provides treatment to patients with specialized staff and equipment. It serves humanity as a whole. It is an integral part of the social welfare of a society or a state.