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 orally. The IV line is connected to a bag containing the fluid or medication, which can be administered continuously or in controlled doses. Healthcare professionals monitor the IV line to ensure proper flow and to prevent complications, such as infection or blockage.