Bagpipes are a wind instrument using enclosed reeds fed from a constant reservoir of air in the form of a bag. Though the Scottish Great Highland bagpipes are the best known in the Anglophone world, bagpipes have been played for a millennium or more throughout large parts of Europe, northern Africa, and western Asia, including Turkey, the Caucasus, and around the Persian Gulf. The term bagpipe is equally correct in the singular or plural, though pipers usually refer to the bagpipes as "the pipes", "a set of pipes" or "a stand of pipes."
A set of bagpipes minimally consists of an air supply, a bag, a chanter, and usually at least one drone. Many bagpipes have more than one drone (and, sometimes, more than one chanter) in various combinations, held in place in stocks—sockets that fasten the various pipes to the bag.
The most common method of supplying air to the bag is through blowing into a blowpipe, or blowstick. In some pipes the player must cover the tip of the blowpipe with their tongue while inhaling, but most blowpipes have a non-return valve that eliminates this need.
An innovation, dating from the 16th or 17th century, is the use of a bellows to supply air. In these pipes, sometimes called "", air is not heated or moistened by the player's breathing, so bellows-driven bagpipes can use more refined or delicate reeds. Such pipes include the Irish uilleann pipes, the Scottish border pipes and Lowland pipes; Northumbrian smallpipes, pastoral pipes and English Border pipes in Britain, and the musette de cour in France.