Beer is made by creating a liquid rich with fermentable material. This â€˜wortâ€™ is moved to a fermentation vessel where yeast, a living organism, is added. Yeast swims around the fermenter gobbling up the soluble sugar and converting that energy into alcohol. Imagine the feeding frenzy of millions of tiny yeast cells eating their way around a big fermenter. Itâ€™s a volatile and active environment. During this time, the beer is literally alive.