We have the words "Jam" and "Jelly". They are just the same thing, is all. If there is a difference, it's probably that jelly has more sugar in it.
I always thought that, while they were made the same (add pectin and sugar), "jam" was when you put the whole, crushed-up fruit, seeds and all with the other ingredients, and "jelly" was when you just put in the juice of the fruit with the other ingredients.
That's why grape jelly is clear purple, but raspberry jam has little raspberry seeds in it.
And yes, this is incredibly trivial.
