Robusta coffee is one of the two main species of coffee beans, the other being Arabica coffee. It is known for its strong, bold flavor and higher caffeine content, which makes it more bitter than Arabica. Robusta beans are typically smaller and rounder, and they grow at lower altitudes, making them more resilient to pests and diseases. This type of coffee is often used in espresso blends and instant coffee due to its rich crema and affordability. Robusta coffee plants are hardier and yield more fruit, making them a popular choice for farmers in regions with challenging growing conditions.