Lager is a well attenuated beer brewed in cool conditions using a slow-acting brewers yeast, known as a bottom-fermenting yeast, and then stored (or "lagered") for a period in cool conditions to clear away particles and certain flavour compounds to produce a clean taste. The most popular examples of beer brewed using the lager method are pale lagers, also known as pilsners.
Ale is a beer brewed from barley malt with a brewers yeast that ferments quickly, giving a sweet, full body and a fruity, and sometimes a butter-like taste. Ales are normally brewed with top-fermenting yeasts. Most ale contains some herb or spice, usually hops, which imparts a bitter, herbal flavor which balances the malt sweetness.
Ales are very common in Britain, Germany, Canada's eastern provinces, the United States, and Belgium; however, pale lager is the dominant style of beer in almost all other countries.