Refrigerator (or freezer) jam differs from shelf-stable jam in that it is not made using the traditional canning process. There is no need to use pectin, no need to sterilize your jars (although you do want them clean), and you can make it quickly and easily. Because it is not preserved, refrigerator jam needs to be stored in an airtight container inside the fridge. For longer term storage, you can put it in the freezer. If you use jars, make sure to allow some room at the top of the jars for expansion.