A Penrose drain is a flexible tube used in medical procedures to remove fluid or pus from a wound or surgical site. It is typically made of soft rubber or silicone and is placed in a cavity to allow drainage while preventing the buildup of fluids that could lead to infection or complications. The drain works by gravity, allowing fluids to flow out of the body and into a collection device. It is often used after surgeries, such as those involving the abdomen or chest, to promote healing and reduce the risk of infection. Proper care and monitoring of the drain are essential for effective healing.