There are many different varieties of single serve coffee machines on the market, but I've a Keurig coffee machine. For the Keurig's coffee machines, you can find over 250 different varieties of coffee to select from. They call their pod a K-cup. K-cups come in the caffeinated and non-caffeinated versions as well. So, you are essentially in a position to brew a gourmet-style cup of coffee in the comfort of your home whenever you want of the day.