Drug-eluting stents are small, mesh-like tubes used to treat narrowed or blocked arteries, particularly in the heart. These stents are coated with medication that slowly releases over time to help prevent the artery from becoming blocked again after the procedure. When a stent is placed in an artery, it helps keep the vessel open, allowing for better blood flow. The medication on the stent reduces the risk of restenosis, which is the re-narrowing of the artery, making these stents an important option in cardiovascular treatments.