Coffee (coffee roots in French) is a black drink containing caffeine and widely used, are produced from the beans are roasted, the coffee tree. Coffee was first used in the 9th century, when it was discovered from the highlands of Ethiopia. From there, it spread to Egypt and Yemen, and by the 15th century, then to Armenia, Persia, Turkey and North Africa. From the Muslim world, coffee to Italy, then the rest of Europe, Indonesia and America. Today, coffee is one of the popular beverage worldwide.

The quality of coffee or caste vary by each plant, each county and different growing areas. Robusta coffee is rated lower than arabica due to lower quality and price which is cheaper. The most expensive coffee in the world's rarest and Kopi Luwak name (or "weasel coffee") of Indonesia and Vietnam. This is not a coffee like that in a coffee processing using the digestion of mongoose. Price per weight of coffee is around 20 million VND (1300 USD) and annual only 200 kg were sold on the world market.

Unlike other beverages, coffee's main function is not refreshing, even though the American people to drink it as refreshments. Many people drink it with the aim of creating excitement. According to a study published in August 2005 by the American chemist Joe Vinson of the University of Scranton, the coffee is an important source of supply of antioxidants (antioxidant) for the body, as previously they are only found in fruits and vegetables. These substances also indirectly reduce the risk of cancer in humans.

Coffee plays an important role in societies throughout modern history. In Africa and Yemen, it was used in religious ceremonies. The result is that the Ethiopian church banned the use of coffee to Menelik II of Ethiopia dynasty. It was banned in Ottoman Turkey during the 17th century for political reasons.

Coffee is an important export commodity. In 2004, coffee was agricultural goods are exported in 12 countries, and in 2005, it exported agricultural 7th legitimate world by value.

Some controversy related to coffee cultivation and its impact on the environment. Some of the comments confirmed the relationship between coffee consumption and current medical condition; and the positive effects of coffee or negative is still being debated.