A coffee bean is a seed of the Coffee Plant, and is the source for Coffee. It is the pit inside the red or purple fruit often referred to as a cherry. Just like cherries, the coffee fruit is also a so called stone fruit. Even though the coffee beans are seeds, they are referred to as 'beans' because of their resemblance to true beans. The fruits - coffee cherries or coffee berries - most commonly contain two stones with their flat sides together