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An espresso machine is a specialized coffee brewing device that uses high pressure to force hot water through finely ground coffee beans. This process results in a concentrated, richly flavored shot of espresso. Espresso machines typically have several components such as a boiler for heating water, a pump for generating pressure, and a group head where the water passes through the coffee grounds. Some advanced models also include features like automatic grinders, programmable settings, and steam wands for frothing milk.