Coffee is darkly colored, bitter, slightly acidic and has a
stimulating effect in humans, primarily due to its caffeine
content.
It is one of the most popular drinks in the world and can be prepared and
presented in a variety of ways (e.g., espresso, French press, caffè latte,
or already-brewed canned coffee).
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It is usually served hot, although chilled or iced coffee is common.
Sugar, sugar substitutes, milk or cream are often used to lessen the
bitter taste or enhance the flavor.