How to Choose a Coffee Machine For Pods Pod machines operate by reading the barcode on the top of the pod (which is actually a disc of sealed, pre-dosed ground beans that are encased between two layers of filter paper). It is easy to insert it and press a button. https://coffeee58635.blogdigy.com/15-best-pinterest-boards-of-all-time-about-best-pod-coffee-machine-42311138