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 push a button. https://coffeeeuk84010.blogoscience.com/34363725/10-meetups-on-best-pod-coffee-machine-you-should-attend