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Caffè espresso or simply espresso (expresso is a colloquial Americanization) is a concentrated beverage brewed by forcing hot water under pressure through finely ground coffee.
Compared to other coffee brewing methods, espresso often has a thicker consistency, a higher concentration of suspended solids, and crema (foam). As a result of the pressurized brewing process, all of the flavours and chemicals in a typical cup of coffee are very concentrated. For this reason, espresso is the base for other drinks, such as lattes, cappuccino, macchiato, mochas, and americanos.