A keg is a cylindrical container typically used to store and dispense beverages, especially beer. Kegs come in various sizes, with the most common being the half-barrel, which holds about 15.5 gallons. They are usually made of stainless steel, which helps preserve the quality of the drink inside. Kegs are often used in bars, restaurants, and at events to serve drinks efficiently. They can be connected to a tap system, allowing for easy pouring. The use of kegs is popular in the brewing industry, where breweries like Anheuser-Busch and Sierra Nevada package their products for distribution.