A stent is a medical device used in surgical procedures to provide support and keep a tube, such as a blood vessel, open. It is typically made of metal or plastic and is inserted into the body during surgery. The term 'stent' is derived from the Latin word for 'to stretch.' Stents are commonly used in cardiology, urology, and gastroenterology to treat conditions such as coronary artery disease, kidney stones, and gastrointestinal disorders.