How to Choose a Coffee Machine For Pods The pod machines read the barcode at the top of the pod (which is actually a disc of sealed, pre-dosed ground coffee that is pressed between two layers of filter paper). You simply insert it and then press a button. This machine https://coffeee-uk72401.webbuzzfeed.com/28855545/a-brief-history-of-pods-coffee-machine-history-of-pods-coffee-machine