Coffee is the third most popular drink in the world. Only tea and water are more popular than coffee. Coffee beans are actually the seeds of coffee cherries that grow on coffee plants. The beans are green when they are picked. Most of the coffee that is sold in coffee shops and grocery stores is brown. It is brown because the beans have been roasted at high temperatures. The roasting gives the beans their different flavors. Some coffees are darker and stronger tasting than other coffees. You can buy green coffee beans from some stores if you want to roast your own beans.