IV infusion, or intravenous infusion, involves the administration of fluids, medications, or other therapeutic agents directly into a vein through a needle or catheter. The process typically begins with the insertion of a sterile needle or catheter into a vein, usually in the arm, hand, or other suitable location. The needle or catheter is secured in place to prevent displacement, and the infusion is started by connecting it to a bag or bottle containing the fluids or medications to be administered. The rate of IV infusion is carefully controlled and adjusted based on the specific needs of the patient and the type of fluid or medication being administered. This is typically determined by the healthcare provider, who considers factors such as the patient's age, weight, medical condition, and desired therapeutic outcome. The fluids or medications are delivered into the bloodstream through the vein, allowing them to rapidly circulate throughout the body and reach the target tissues or organs. This allows for quick absorption and distribution of the therapeutic agents, leading to faster onset of action compared to other routes of administration.