What function of normal saline?

Normal saline, a sterile solution of 0.9% sodium chloride in water, is primarily used for hydration and electrolyte balance in patients. It helps to replenish fluids lost due to surgery, injury, or illness and is often used as a diluent for medications. Additionally, it can be used for wound irrigation and as a vehicle for intravenous drug administration. Its isotonic nature makes it safe for various medical applications without causing significant shifts in fluid balance.