One important element to making bear is yeast. Without it, beer cannot be brewed. A special type of yeast called brewer’s yeast is specifically used for making beer. Brewer’s yeast is even further classified into lager and ale yeasts. Lager yeast sinks during the fermentation process and requires low temperatures of about 40 to 50 degrees Fahrenheit. Ale yeast on the other hand remains on top during the fermentation process and requires temperatures of about 55 to 65 degrees F. Ale yeast is used more often for home brewing beer because it is difficult to maintain the temperature required by lager yeast.