Apple juice is filtered to get rid of pulp and then it's pasteurized to give it longer shelf life. Apple cider, on the other hand, is made from an apple mash (similar to applesauce) which is pressed into juice. So apple cider is like a raw apple juice that isn't filtered and can still have some bits of pulp in there. It doesn't last as long as apple juice and must be refrigerated. If it's unpasteurized, it can ferment over time, leaving you with hard cider!