Question: what is the difference between a lager and a stout?
Answer: Lagers are defined by lager yeast, cold fermentation, and lagering. Classic lagers are pale, but there are varieties of lagers which are not. Stouts are defined by ale yeast, warm fermentation, and some amount of roasted malt, providing both the darker color and a bitterness undefined by IBUs (i.e. separate from hops).