In English Quebec we use same words as U.S. but some differently...

Jelly is made from fruit juice and gelatin. Not a common item in Québec as the French tend to prefer jam. We do have mint jelly to put on lamb.

Jam is made from fruit but is NOT homogenous, it has a lot of fruit pulp and intact pieces of fruit. The fruit is cooked on stovetop with sugar. In Québec, jam is very thick. In most of the other Canadian provinces jam is much runnier.

Preserves is not a word that is used for jam or jelly but for anything that you "can" (mason jars). For example you might have tomato preserves from your garden of the summer before. Oddly, you can make jam from your garden fruit but you still don't call it preserves.