Since NFM missed this one, I'll answer.
There are three general types of beers; Lagers, Ales, and Lambics. A Stout would fall under 'Ales'.
The basic difference between the two is the type of yeast used. A lager uses bottom-fermenting yeast and is brewed slightly below room temperature, while an ale uses top-fermenting yeast and is brewed at room temperature. Lambics are beers brewed using 'spontaneous fermentation' from native wild yeasts and bacteria, rather than brewers exposing liquids to cultivated yeast. This is only done in the Senne valley in Belgium.
I didn't miss it. Here is my reply from Page 1.
What's the difference between a lager and a stout? Does it have something to do with the hops?
Actually it depends a lot on the yeast. Lager is made with bottom fermenting yeast, where as Stout is a top fermented beer made from ale malt, roasted unmalted barley, and often caramel malt.
Lager is much more similar to Pilsner than it is to Stout.
Edited by Never Forget Mac #25, 13 June 2007 - 08:46 AM.