There are four different types of coffee beans, those being Robusta, Arabica, Liberica, and Excelsa. However, the Arabica coffee bean is the most common, making up about 60% - 70% of the coffee that is produced globally. Robusta is also a more common coffee bean used in coffee. Liberica and Excelsa are the least common coffee beans, but you may sometimes come across them.

Source: Nescafe Global