Espresso is the base of almost every type of coffee. Baristas making espresso use water under high amounts of pressure to force its way through compacted ground coffee, which makes a thick, syrupy liquid, with a gorgeous light brown foam layer on top, called the crema. That's the main difference - other coffee types rely on a slower filtering process, allowing hot water to slowly sift through coffee grounds. Espresso also relies on a much finer bean grind, while regular coffee works perfectly with medium ground beans.
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