And as I will explain later, there are two options. The role of a grinder is to crush and grind coffee beans. They then turn into a very fine powder. If you buy fresh beans, your ground coffee will be full of flavor and fragrant oils. A built-in grinder is a milling machine. So you will never have to bear the costs of grinding coffee beans again. Instead, you will grind and prepare your favorite drink at home. Since there are different units, you can brew as much coffee as you want. Some machines can produce up to twelve cups. Plus, your drink stays warm in a warming plate or thermal carafe. Best of all, your equipment will be easy to clean in the dishwasher or at your fingertips