Brewing yeast strains are unicellular fungi that convert simple sugars into approximately equal parts of alcohol and carbon dioxide during the fermentation process. There are two main types of beer yeast varieties: saccharomyces cerevisiae, which is a top fermenting ale yeast, and saccharomyces pastorianusis, a bottom fermenting lager yeast.
A wide selection of home brewing ale and lager yeast can be found here:
Below is an image of a fermenting Flanders Red Ale style beer in two glass carboys with a flask of yeast in front of them:
Yeast and Fermenting Beer
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