A surgical drain is a medical device used to remove fluids that accumulate in a surgical site after an operation. It helps prevent complications such as infection or fluid buildup, which can hinder healing. The drain is typically a thin tube inserted into the body and connected to a collection bag or container. There are various types of surgical drains, including Jackson-Pratt drains and Penrose drains, each designed for specific situations. Healthcare professionals monitor the amount and type of fluid collected to assess the healing process and determine when the drain can be safely removed.