A single espresso is a concentrated coffee beverage brewed by forcing hot water through finely-ground coffee beans under high pressure. Typically served in a small shot glass or demitasse cup, a single espresso shot consists of about 1 ounce (30 milliliters) of rich, full-bodied coffee.

The brewing process creates a layer of crema, a golden, frothy foam that sits atop the espresso, contributing to its aroma and flavor. A single espresso showcases the unique characteristics of the coffee beans used, including their acidity, sweetness, and flavor notes.

Espresso is often enjoyed on its own, but it also serves as the foundation for a variety of other coffee drinks, such as lattes, cappuccinos, and macchiatos. Its intense flavor and quick preparation make it a popular choice for coffee lovers seeking an invigorating caffeine boost.