A central line is a type of catheter that is inserted into a large vein, typically in the neck, chest, or groin. It is used to administer medications, fluids, or blood products directly into the bloodstream. Central lines are often used for patients who require long-term treatment or have difficult venous access. These lines can also be used for monitoring central venous pressure, which helps assess heart function and fluid status. Central lines are commonly placed by healthcare professionals in hospitals and are essential for managing critically ill patients or those undergoing extensive medical treatments.