The term "Emergency Room," commonly referred to as ER, is a medical facility within a hospital that is specifically designed and equipped to provide immediate medical care to patients with acute illnesses or injuries. The emergency department is staffed by physicians, nurses, and other healthcare professionals who are trained in the evaluation and treatment of urgent conditions such as chest pain, stroke symptoms, severe trauma, or life-threatening situations. Patients may be seen on a walk-in basis without an appointment, and the goal is to stabilize their condition quickly so they can either recover or be transferred to another unit for further treatment. The emergency room is often associated with high costs due to its 24/7 availability and advanced resources required to treat patients in need of immediate care.