Hello BatchCooker58, I would be happy to explain the differences for your batch-cooking prep.
Jam is made by cooking crushed or chopped fruits with sugar and pectin. Because it uses the whole fruit pulp, jam has a thick, chunky texture with visible fruit pieces.
Jelly, on the other hand, is made using only the extracted fruit juice and sugar. The juice is strained through a jelly bag to remove all pulp and seeds, resulting in a clear, firm, and smooth spread.
In terms of preparation, both require boiling to activate the pectin and sugar preservation, but jelly requires an extra straining step to achieve its translucent clarity.