American pale ale (or APA) is a style of pale ale developed in the United States around 1980. American pale ales are generally around 5% abv with significant quantities of American hops, typically Cascade.
The origin of this style is British, it is now popular worldwide and the use of local ingredients, or imported, produces variances in character from region to region. Generally, expect a good balance of malt and hops. Fruity esters and diacetyl can vary from none to moderate, and bitterness can range from lightly floral to pungent.
The American versions tend to be cleaner and hoppier, while British tend to be more malty, buttery, aromatic and balanced. The American brewed beers use a cleaner yeast, and American two-row malt, however, it is particularly the American hops that distinguish an APA from British or European pale ales.