Draught beer, also spelt draft, is beer served from a cask or keg rather than from a bottle or can. Draught beer served from a pressurised keg is also known as keg beer.
Draught beer fonts at the Delirium Café in Brussels
A typical 50-litre (11 imp gal) keg with single opening in the centre of the top end
Beer is an alcoholic beverage produced by the brewing and fermentation of starches from cereal grain—most commonly malted barley, although wheat, maize, rice, and oats are also used. The grain is mash
Draught beer
…Draught beer, also spelt draft, is beer served from a cask or keg rather than from a bottle or can. Draught beer served from a pressurised keg is also known as keg beer…
Ancient Egyptian painting, 18th dynasty, reign of Akhenaten, c. 1300 BC, showing Syrian mercenary drinking beer through a straw. Egyptian Museum of Berlin
François Jaques: Peasants enjoying beer at pub in Fribourg (Switzerland, 1923)
Malted barley before roasting