noun. beer drawn or available to be drawn from a cask or barrel.
When you get into the thick of it, there really isn't any difference between craft vs draft. Since any beer, be it domestic or craft or something from a microbrewery can all be put on tap, thereby making it a draft beer. Conversely, draft beer can come from anything stored in a keg and drawn from the tap.
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.