The two most well-known grown coffee bean types are C. arabica also known as the Arabian coffee and C. robusta known as Robusta coffee. Robusta is coffee made from beans of the plant Coffea canephora. ¹⁾

Kopi luwak is brewed from coffee beans that traveled the gastrointestinal tract of an Asian palm civet and then were pooped out. During the travel, the beans are subjected to a combination of acidic, enzymatic, and fermentation treatment. ²⁾.