Surgical drains are tubes placed after surgery to remove fluids from a wound. They do not improve healing or prevent infection on their own but can help drain fluid that could cause issues. There are different types including open or closed drains, active drains with suction or passive drains, and examples are described like Jackson-Pratt drains and Penrose drains. Risks of drains include infection, breakage, or pain upon removal, so care must be taken with maintenance and removal.