A stent is a small, tube-shaped device, typically made of metal, used to keep weakened or narrowed blood vessels and ducts open, thereby improving blood flow and alleviating blockages. It is commonly used to open narrowed coronary arteries, which supply oxygen-rich blood to the heart, thus ensuring blood flow to the heart muscle and other parts of the body. Stents can also be used in other bodily ducts, such as bile ducts and urinary tracts, to relieve blockages caused by conditions like tumors or stones and maintain flow. The material and design of the stent vary depending on the condition being treated and its location in the body. Some stents are permanently placed in the body, while others are used temporarily.