Coffee is a black beverage that contains caffeine and is obtained from roasted and ground coffee beans. Coffee beans are the fruits of coffee trees in the family Rubiaceae, genus Coffea, with two more important varieties: Coffea arabica and Coffea robusta (Coffea canephora). Coffea arabica provides the varieties with the smoothest flavors, while Coffea robusta is more bitter and less aromatic. The quality of coffee is influenced by the place of cultivation, storage and the roasting process of the coffee beans. Coffee is a black liquid, it is bitter and slightly acidic, having a stimulating effect on humans due to its caffeine content. It is one of the most popular drinks and can be consumed in different forms (eg espresso or cappuccino). It is usually consumed as a hot drink, but iced coffee is a popular alternative. Some studies indicate that it has a beneficial effect on adults, but long-term studies have not been able to prove this due to their poor quality. The earliest credible information on coffee consumption dates back to the 15th century, in Yemen, the Arabian Peninsula. In those regions, coffee beans were first roasted and consumed in a similar way to today. The origin of coffee beans is believed to be from the region of Ethiopia, North Africa. Coffee is produced in more than 50 countries around the globe, with the main producer being Brazil, followed by Vietnam, Colombia, Indonesia and Mexico
