IV lines, or intravenous lines, are medical devices used to deliver fluids, medications, or nutrients directly into a patient's bloodstream. They consist of a thin, flexible tube that is inserted into a vein, usually in the arm or hand. This method allows for quick and effective treatment, especially in emergencies or for patients who cannot take medications by mouth. The IV line is connected to a bag containing the necessary fluids, which can include saline, antibiotics, or even blood products. Medical professionals, such as nurses or doctors, monitor the IV line to ensure it is functioning properly and to adjust the flow rate as needed for the patient's care.