Starbucks uses high-quality 100% Arabica beans and burns the beans to create a fuller, more powerful ‘coffee’ flavor that we love to wake us up in the morning - or in our case, all day.  Many people believe that Starbucks coffee is rather bitter, despite being made of the finest Arabica coffee. This is because Starbucks roasts their coffee at a higher temperature due to demand, and will therefore create a darker, stronger, and more bitter or burnt roast. There are two types of coffee beans; arabica and robusta beans. Arabica beans are the most commonly consumed coffee beans around the world. These are considered high-quality coffee bean that is used by many coffee chains and companies for their distinguished taste.  Robusta beans are also sometimes utilized by coffee giants because they have a more bitter flavor, which makes them great for brewing espresso with their dark roast taste. The bitter flavor we love in commercial coffee is because the beans are burned. This is where the strong, bitter flavor comes from in Starbucks coffee.