Brewing is the production of beer through steeping a starch source (commonly cereal grains) in water and then fermenting with yeast. It is done in a brewery by a brewer, and the brewing industry is part of most western economies. Brewing has taken place since around the 6th millennium BC, and archaeological evidence suggests that this technique was used in most emerging civilizations including ancient Egypt and Mesopotamia.The basic ingredients of beer are water; a starch source, such as malted barley, which is able to be fermented (converted into alcohol); a brewer’s yeast to induce fermentation; and a flavouring, such as hops. A secondary starch source (an adjunct) may be used, such as maize (corn), rice or sugar. Less widely used starch sources include millet, sorghum and cassava root in Africa, potato in Brazil, and agave in Mexico, among others. The amount of each starch source in a beer recipe is collectively called the grain bill.Brew Your Own Beer