Bier is a popular alcoholic beverage made from fermented grains, primarily barley, wheat, or corn. The brewing process involves four main ingredients: water, malted grains, hops, and yeast. The combination of these ingredients creates a variety of flavors, aromas, and alcohol content, making bier a diverse drink enjoyed worldwide. There are many styles of bier, including lager, ale, and stout, each with unique characteristics. The fermentation process can be either top-fermented, as in ales, or bottom-fermented, as in lagers. Bier is often served in various types of glasses, enhancing the drinking experience.