Espresso is a concentrated coffee beverage brewed by forcing hot water through finely-ground coffee beans. It is known for its rich flavor and thick consistency, often served in small, strong shots. The brewing process requires an espresso machine, which uses high pressure to extract the coffee's oils and flavors quickly. Espresso serves as the base for many popular coffee drinks, such as cappuccino, latte, and macchiato. It typically has a higher caffeine content per ounce compared to regular brewed coffee, making it a popular choice for those seeking a quick energy boost.