How to Choose a Coffee Machine For Pods Pod machines work by reading the barcode that is on the top of the pod (which is actually a disc of sealed, pre-dosed ground coffee compressed between two layers of filter paper). Simply insert it into the machine and press a button. https://coffeee-uk57600.dbblog.net/1566820/the-10-most-scariest-things-about-best-pod-coffee-machine