Did you know? Coffee beans are the seeds of the fruit of the coffee tree, which are handpicked and require roasting to develop their intoxicating aroma and rich brown colour. There are two main species of coffee beans, arabica and robusta. Arabica is the finest, and accounts for more than 70 percent of the world's production. Robusta, or canephora, has twice the caffeine content of arabica, but less flavour.