Lager is a type of beer brewed and conditioned at low temperature. Lagers can be pale, amber, or dark. Pale lager is the most widely consumed and commercially available style of beer. The term "lager" comes from the German word for "storage", as the beer was stored before drinking, traditionally in the same cool caves in which it was fermented.

Beer styles differentiate and categorise beers by colour, flavour, strength, ingredients, production method, recipe, history, or origin.