Excluding water, coffee is the most heavily consumed beverage in the world, with over 400 billion cups consumed every year worldwide. It is a brewed drink prepared from roasted coffee beans, which are the seeds, or berries of the Coffea plant.
The two most common types of coffee beans are the highly regarded Coffea Arabica, and the Robusta form of the more durable Coffea Canephora. Arabica coffee has a nicer taste and aroma, and a lower caffeine content, and Robusta coffee has a more bitter taste, a caffeine content around twice as high as Arabica, and is resistant to coffee leaf rust, along with other pesticides.
Once ripe, coffee berries are picked, processed and dried. Dried coffee beans are roasted to varying degrees, depending on the desired flavour, and the roasted beans are ground and brewed with boiling water to produce coffee as a beverage.