Jelly, made from fruit juice, smooth gel.
Jam, made from mashed fruit, chunks of fruit and gel.
Preserves, whole fruit or fruit pieces preserved in syrup derived from its own juices and sugar.
Canned fruit, whole or fruit pieces preserved in a sugar/water syrup.
Marmalade, a jam made from citrus using the citrus rinds.

Use to make grapefruit marmalade dang it was good

Kumquat makes a real good marmalade.