UK. Jelly is either a dessert made of flavoured gelatine, or a jelled preserve of fruit and sugar, but differentiated from Jam by having the cooked fruit strained through a cloth and only using the clear liquid before adding sugar and boiling to set point, so no bits in it and should be clear. Jam is a preserve made retaining whole or pieces of fruit. Spread is anything that you can spread on toast or put in a sandwich, so Nutella, Marmite, and that beloved mixture of salad cream and chopped pickles known simply as Sandwich Spread would fall into this category. Marmalade is a citrus preserve where the peel and pips are the source of the jelling agent pectin, so tends to bitterness. It usually retains the peel (but not the pips) but even if it's clear, it would still be called marmalade not jelly.
