A venous catheter is a thin, flexible tube inserted into a vein to provide access for medical treatments. It is commonly used for administering medications, fluids, or blood products, and for drawing blood samples. Venous catheters can be placed in various locations, including the arms, hands, or central veins near the heart. There are different types of venous catheters, such as peripheral catheters and central venous catheters. Peripheral catheters are typically used for short-term access, while central venous catheters are designed for long-term use and can remain in place for weeks or months. Proper placement and care are essential to prevent complications like infections.