Stout is a dark beer made using roasted malt or roasted barley, hops, water and yeast. Stouts were traditionally the generic term for the strongest or stoutest porters, typically 7% or 8%, produced by a brewery. There are a number of variations including Baltic porter, milk stout, and imperial stout; the most common variation is dry stout, exemplified by Guinness Draught, the world's best selling stout.