Arabica and Robusta are both coffee plants, (Coffea Arabica and Coffea Canephora or Coffea Robusta). Each produces coffee beans. The flavour, aroma and texture of Arabica is better, more subtle and more sophisticated than Robusta, but Arabica is more difficult to grow, more expensive and doesn’t yield nearly as well. Robusta is hardier, with better disease resistance and gives a much bigger crop. Arabica beans have a sweeter, more complex flavour and a higher acidity than Robusta beans, which have a harsher, more bitter flavour. Robusta is much stronger and has almost double the caffeine of Arabica. Almost all specialist coffee is Arabica, almost all instant coffee is Robusta.