Coffee is a drink made from coffee beans. It contains caffeine, which is a stimulant. There are mainly two types: arabica and robusta. Arabica tastes better, but it is not as resistant to decease as robusta. Robusta is usually more bitter and contains more caffeine. Robusta is cheaper and is therefore sometimes added to arabica to lower the cost.

It is the most popular beverage in the world. Brazil, which is the largest grower, produces about 30% of the world production. Other large producers are Vietnam, Indonesia, Colombia, Mexico and India.

There is some controversy over effects that it produces. It is a stimulant and for this reason it is often consumed in the morning. There are several benefits. It makes pain killers like aspirin more effective. This is the reason why a small dose of caffeine is added to aspirin. It apparently has also beneficial effects on the liver and can prevent colon cancer.

Many users can experience a nervous condition when they consume too much caffeine. It can stain the teeth and increase blood pressure. There could be other benefits and risks associated with coffee drinking.