A venous catheter is a thin, flexible tube inserted into a vein to provide access for medical treatments. It allows healthcare providers to deliver medications, fluids, or nutrients directly into the bloodstream. Venous catheters are commonly used in hospitals for patients who require long-term intravenous therapy or frequent blood draws. These catheters can be placed in various locations, such as the arm or neck, depending on the patient's needs. They come in different types, including peripheral and central venous catheters, each serving specific purposes. Proper care and maintenance are essential to prevent complications like infections or blood clots.