Extended data coffee is a kind of beverage made from roasted coffee beans, and it is the main drink that is popular all over the world together with cocoa and tea.
Coffee tree is a small evergreen tree of Rubiaceae. Coffee for daily drinking is made from coffee beans and various cookers. Coffee beans refer to nuts in the fruit of coffee trees, which are baked in an appropriate way. A cup of standard coffee should not be bitter. A qualified barista will strictly carry out every step when making coffee, and finally the coffee presented to the guests will be sweet, sour, mellow or clean in different degrees.
References:
Baidu encyclopedia-coffee