The type of coffee is called coffea in the biological genus.

Coffee belongs to the genus Coffea. The genus is a member of the Rubiaceae family, which has more than 500 species and more than 6000 varieties, most of which are tropical trees and shrubs.

From a drinker's point of view, coffee trees can be roughly divided into five species, of which Arabica and Robusta are the more common.

Arabica species accounts for more than 70% of the world's total production. This variety is generally planted on slopes above 900 meters above sea level and is mostly produced in tropical high altitude areas such as Central and South America, East Africa, Southeast Asia and Hawaii. Corresponding to its pleasant aroma and rich taste, the tree species requires more artificial care and requires higher stability of temperature and humidity in the climate, so the price is naturally more expensive. Arabica is divided into many varieties, including the ancient Bourbon and other fine varieties such as Catuna, Catuai and Typica, which are generally adopted by growing countries. Of course, they may be pure, hybrid or mixed-that is, different varieties are planted in a plantation and then mixed together after picking, thereby increasing the complexity of coffee flavor. There are some exceptions, however: Sumatra is home to the endemic Sumatra species, while older growing countries like Ethiopia have their own distinct and traditional varieties.

Roscoff, which is more adaptable to the environment, tastes mediocre, bitter and, more importantly, contains 2 to 3 times as much caffeine as Arabica. Generally grown in the slope of 200~600 meters above sea level, the requirements for artificial care are very low, the price is low, and it is mostly used for canned and instant coffee.