Beer is the oldest and most widely consumed alcoholic beverage in the world. It is the third most popular drink after water and tea. The production of beer is called brewing, which involves the fermentation of starch, which comes mainly from cereal grains (most commonly germinated barley), although wheat, corn (corn) and rice are widely used. Most beers are flavored with hops, which adds bitterness and acts as a natural preservative, although other flavorings, such as herbs or fruits, can sometimes be added. Fermentation produces natural carbonation, although it is usually removed during processing and replaced by forced carbonation. Some of the earliest known works involve the production and sale of beer: the Hammurabi code includes laws regulating beer and beer hotels, and the prayer to Mesopotamia's beer goddess, the hymn to nimkasi, is both a prayer and a prayer. As a way of remembering beer recipes among less educated people.

Beer is sold in bottles and cans; it can also be used in draught areas, especially bars and bars. The brewing industry is a global business composed of several major multinational companies and thousands of small producers, from pubs to regional breweries. Beer concentrations are usually 4% to 6% by volume of alcohol, although they may vary from 0.5% to 20%, with some breweries having 40% or higher alcohol accuracy. Beer is a part of the culture of beer drinking countries, which is related to social traditions such as beer festival and rich bar culture, which involves activities such as bar crawling and bar games such as bar billiards.