Cocoa powder, an unsweetened chocolate product, adds deep chocolate flavor to desserts and beverages. Cocoa powder occurs when the fat, called cocoa butter, gets removed from the cacao beans during processing. The leftover dried solids get ground into the product sold as cocoa powder.
Higher-quality cocoa powder retains slightly more cocoa butter than lesser brands. Cocoa powder is the missing ingredient in so-called “white chocolate,” which is produced by combining cocoa butter and sugar (plus an emulsifier) but no actual cocoa solids.