Robusta coffee is coffee made from the Coffea canephora plant, a sturdy species of coffee bean with low acidity and high bitterness. C. canephora beans, widely known by the synonym Coffea robusta, are used primarily in instant coffee, espresso, and as a filler in ground coffee blends.
Robusta has its origins in central and western sub-Saharan Africa. It is easy to care for, has a greater crop yield, has almost double the amount of caffeine and more antioxidants, and is less susceptible to disease than arabica coffea. It represents approximately 40% of global coffee production, with arabica constituting the balance. Roasted robusta beans produce a strong, full-bodied coffee with a distinctive, earthy flavour, but usually with more bitterness than arabica due to their high pyrazine content.