Coffee is a brewed drink prepared from roasted coffee beans, the seeds
of berries from certain Coffea species. From the coffee fruit, the seeds
are separated to produce a stable, raw product: unroasted green coffee.
The seeds are then roasted, a process which transforms them into a
consumable product: roasted coffee, which is ground into fine particles
that are typically steeped in hot water before being filtered out,
producing 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.