Where Do Guatemala Coffee Beans Come From? Coffee is a brewed drink prepared from roasted coffee beans, the seeds of berries from certain Coffea species. 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 it can be prepared and presented in a variety of ways (e.g., espresso, French press, caffè latte).