IV sets (intravenous administration sets) are sterile tubing systems that deliver fluids, medications, blood products, or nutrition from IV bags to patients via indwelling catheters, featuring a spike (pierces bag), drip chamber (visualizes flow rate: macro 10-20gtt/mL, micro 60gtt/mL), roller clamp/flow regulator (adjusts drops/min), injection ports/Y-sites (med additions), 0.2-15μm inline filters (remove particulates/air), and Luer lock connector. Types: vented (air inlet for glass/rigid bags), non-vented (flexible PVC), DEHP-free (sensitive patients), light-protected (photodegradable drugs), pump-specific (anti-free-flow), blood sets (larger bore 170-260μm filter). Gravity or electronic infusion pumps control rates 0.1-1500mL/hr.