In the vast world of beer, various factors define the different styles. The key elements include the type of yeast used in fermentation, the brewing process, and the ingredients such as malt and hops. Each style of beer has its unique taste, color, aroma, and alcohol content, all shaped by these factors. For instance, ales are generally robust and complex, while lagers are smooth and crisp due to their different brewing methods. So, next time you grab a pint, remember there's a world of science and tradition behind that unique flavor of your favorite brew.