This article is from the rec.food.drink.beer FAQ, by John Lock with numerous contributions by others.
Technically speaking, draught beer is beer served from the cask in
which it has been conditioned. It 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 to try to convince
us that the beer inside tastes like it came from a cask. See also
"Real Ale".
 
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