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What is "draught" (draft) beer?

Technically speaking, draught beer is beer served from the cask in which it has been conditioned. This term has been applied, loosely, to any beer served from a large container. More recently, it has been used as a promotional term for canned or bottled beer, in a bid to convince consumers that the beer inside tastes like it came from a cask.

Source : FAQ of alt.drinks.beer