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Coffee is a brewed drink prepared from roasted seeds, normally known as coffee beans, of the coffee plant. They are seeds of coffee cherries that grow on trees in over 70 countries. Green unroasted coffee is one of the most traded agricultural commodities in the world. Due to its caffeine content, coffee might have a stimulating effect in humans. Today, coffee is one of the most popular drinks worldwide.


The energizing effect of the coffee bean plant is believed to have been discovered in Yemen in Arabia and in the northeast region of Ethiopia and the cultivation of coffee first expanded in the Arab world. The earliest credible confirmation of coffee drinking appears in the middle of the fifteenth century, in the Sufi monasteries of Yemen in southern Arabia. From the Muslim world, coffee spread to Italy, then to the remainder of Europe, to Indonesia and to the Americas. Coffee has played an important role in many societies all the way through history. In Africa and Yemen, it was used in religious ceremonies. As a result, the Ethiopian Church banned its secular consumption, a ban in effect until the reign of Emperor Menelik II of Ethiopia. It was banned in Ottoman Turkey throughout the seventeenth century for political reasons and was associated with rebellious political activities in Europe.

Coffee berries, which contain the coffee seed or "bean", are produced by several species of small evergreen bush of the genus Coffea. The two most commonly grown are the highly regarded Coffea arabica as well as the 'robusta' form of the hardier Coffea canephora. The latter is resistant to the devastating coffee leaf rust (Hemileia vastatrix). Both are cultivated primarily in Latin America, Southeast Asia and Africa. Once ripe, coffee berries are picked, processed and dried. The seeds are then roasted to varying degrees, depending on the desired flavour. They are then ground and brewed to create coffee. Coffee may be prepared and presented in many different ways. 

An important export commodity, coffee was the top agricultural export for twelve countries in 2004 and it was the world's seventh-largest lawful agricultural export by value in 2005. Some controversy is associated with coffee cultivation and its impact on the environment. Many studies have examined the connection between coffee consumption and certain medical conditions; whether the overall effects of coffee are ultimately positive or negative has been widely disputed. The method of brewing coffee has been found to be important to its health effects.