The dark, chocolate-brown powder you use to make brownies or devil's food cake is called cocoa. Cocoa consists of finely ground roasted cacao beans.
You can use cocoa to make many chocolate treats, including pudding, cake, cookies, and hot chocolate — which is also called cocoa. Although cocoa powder smells delicious, it has to be mixed with sugar or some other sweetener for it to taste good. When the word cocoa was first used in the early 18th century, it was based on a mistake, mixing up the letters of cacao, the seed that's used to make cocoa.