This article is from the rec.food.drink.beer FAQ, by John Lock with numerous contributions by others.
Ales are brewed with "top-fermenting" yeasts at close to room
temperatures, 50-70F (10-21C). Ales encompass the broadest range of
beer styles including bitters, pale ales, porters, stouts, barley
wines, trappist, lambic, and alt. The British Isles are famous for
their ales and it is a popular style with homebrewers and
micro-breweries.
 
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