Espresso (; ) is coffee brewed by forcing a small amount of nearly boiling water under pressure through finely ground coffee beans. Espresso is generally thicker than coffee brewed by other methods, has a higher concentration of suspended and dissolved solids, and has crema on top (a foam with a creamy consistency). As a result of the pressurized brewing process, the flavors and chemicals in a typical cup of espresso are very concentrated. Espresso is the base for other drinks, such as a caffè latte, cappuccino, caffè macchiato, cafe mocha, or caffè Americano. Espresso has more caffeine per unit volume than most coffee beverages, but because the usual serving size is much smaller, the total caffeine content is less. Although the actual caffeine content of any coffee drink varies by size, bean origin, roast method and other factors, the caffeine content of “typical” servings of espresso vs. drip brew are 53 mg vs. 95 to 200 mg.How much caffeine is in your daily habit? – MayoClinic.com