While the draft spelling is much more common for beer in American English, draught is sometimes used for imported beers or the beer "on draught" at American establishments that are either notably British or notably fancy. Otherwise, draught is strictly a British English variant.
Is draught pronounced draft?
Draught is a variant spelling of draft and is normally pronounced the same way, as [draft] or [drahft] or with a vowel somewhere between [a] and [ah]. A pronunciation [drawt] is sometimes heard for draught, perhaps because -aught is frequently pronounced [-awt] elsewhere, as in caught and taught.
What is draught or 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.