What is the difference between jam and jelly? One of the more revealing discoveries we made early on with our kitchen products was that many folks didn't know what the difference was between jam and jelly. We both grew up in large families, seven kids in each, where canning fruits and vegetables was a given and the picking and processing was a mandatory participatory sport. Going into the winter with a cellar shelf full or various jams and jellies was a comforting feeling and well worth the effort. How times have changed.