Coffee is a brewed drink prepared from roasted coffee
beans, the seeds of berries from certain Coffea species. All fruit must
be further processed from a raw material—the fruit and seed—into a
stable, raw product; un-roasted, green coffee. To process the berries,
the seed is separated from the fruit to produce green coffee. Green
coffee is then roasted, a process which transforms the raw product
(green coffee) into a consumable product (roasted coffee). Roasted
coffee is ground into a powder and mixed with water to produce a cup of
coffee.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). It is usually served hot,
although chilled or iced coffee is common.