Coffee is a brewed drink prepared from roasted
coffee beans, the seeds of berries from certain flowering plants in
the Coffea genus. 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.
Learn more at Wikipedia