Largely 3 families of coffee :
Arabica. More expensive. Smooth and quality coffee drink. Associated with fine coffee. Lower caffeine than Robusta. Grown at high altitude. Brazil is biggest producer
Robusta. Less expensive than Robusta. Harsh and steep taste. Serve as morning or wake-me-up cofee as it contains http://premier-pharmacy.com/product-category/sleeping-aids/ alot more caffeine than Arabica. Vietnam is largest producer.
Libreica. Found is central and western Africa. The output is less than 5% of the total coffee output in the world. Robusta and Arabica combined, constitutes more than 95% of world output.