An infusion set is a medical device, usually tubing with a cannula (thin tube) or needle, that delivers fluids, medications, insulin, or nutrients into the body, either intravenously (IV) or subcutaneously (under the skin) from a pump. It connects the fluid source (like an IV bag or insulin pump) to the patient, featuring components like tubing, connectors, and sometimes filters, with types varying by application (IVs, insulin pumps) and featuring different cannula lengths and insertion methods.