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An ER diagram of a hospital represents the structure and relationships among various entities involved in hospital management, helping to organize patient records, staff information, and medical services efficiently. It visually defines how entities such as patients, doctors, nurses, departments, appointments, and treatments are connected to each other within the hospital database system. In this diagram, the patient entity is linked to appointments and medical records, showing details like patient ID, name, contact, and medical history. The doctor entity connects with departments and appointments, including attributes such as doctor ID, name, specialization, and availability schedule. The relationship between doctors and patients is often many-to-many, represented through the appointment entity, where one doctor can handle multiple patients and one patient can visit multiple doctors.