A draft beer system is a setup used to serve beer from kegs rather than bottles or cans. It typically includes components like a keg, tap, and CO2 tank to maintain the beer's freshness and carbonation. The beer is stored in a keg and is pushed through a series of tubes to the tap, where it is poured into a glass. This system is popular in bars and restaurants because it allows for quick service and can keep beer cold and fresh for longer periods. Proper maintenance of the draft beer system is essential to ensure the quality and taste of the beer served.