You brew beer using only four ingredients: hops, water, yeast, and malt. The process of making beer is known as brewing. It is the process of heating and chilling water, hops, and malt to release a variety of floral, aromatic, bittering flavors and fermentable sugars to convert them into alcohol.
After the water, hops, and malt has been cooked, chilled, and strained, the yeast can attach itself to the sugars released by the malted barley. Yeast, a microorganism, consumes sugar, produces alcohol, and creates distinct flavors, resulting in the beer we all know and love.