There are two main species of the coffee plant used to commercially produce coffee: 1) Coffee arabica, which originated in the Middle East, and 2) Coffea robusta, which originated in the Congo. Arabica trees produce the best quality coffee and are the most widely cultivated (3/4 of the world's coffee), while Robusta beans are hardier, contain 40-50% more caffeine, and are used in many instant coffees
