Beers in Britain are typically ales, which are a type of beer brewed using warm fermentation with a strain of brewers' yeast. Ales are usually top-fermented, meaning that the yeast rises to the top of the fermentation vessel during the brewing process. They are generally darker in color and have a stronger flavor than lagers, which are bottom-fermented. Ales are popular in Britain, and many traditional pubs serve a variety of ales from local breweries.