Infusion pumps are programmable medical devices that deliver precise volumes of fluids, medications, electrolytes, nutrients, or blood products intravenously at controlled rates, preventing errors from manual IV drips. Using peristaltic rollers (squeezing tubing in waves), syringe plungers, or cassette mechanisms, they maintain flows from microliters to liters per hour (mL/h), with alarms for occlusions, air bubbles, low battery, or dosing limits. Volumetric pumps handle large fluids like saline; syringe pumps suit small precise doses in ICUs; ambulatory/PCA models enable home chemotherapy, pain management, or insulin therapy. Essential in hospitals, surgery, and homecare, they reduce overdose risks in critical care for vasopressors or antibiotics.