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, which work together to deliver fresh beer. The system maintains the beer's carbonation and temperature, ensuring a quality pour. The main parts of a draft beer system include the keg, which holds the beer, and the tap, which dispenses it. A CO2 tank provides the necessary pressure to push the beer from the keg through the lines to the tap. Proper maintenance is essential for optimal performance and taste.