A suction drain is a medical device used to remove fluids from a surgical site or wound. It consists of a flexible tube connected to a collection container, which creates a vacuum to draw out excess blood, pus, or other fluids. This helps prevent infection and promotes healing by keeping the area dry. Suction drains are commonly used after surgeries, such as those involving the abdomen, breast, or joint replacements. They can be temporary and are usually removed once the fluid output decreases, indicating that the body is healing properly. Proper care and monitoring of the drain are essential for patient safety.