A jam includes the flesh of the fruit (a jelly includes only the juice); technically, both jams and jellies are kinds of preserves, but people often think of a preserve as including the whole fruit (no pits) where the fruit retains its shape, whereas a jam is smooth.
Jam is made with whole fruit that is cooked down to release the pectin. Jelly is made with fruit juice that pectin is added to. While many canners of today use pectin in jam, it is not traditional. Preserves use the whole fruit without breaking it up, and marmalade uses the zest and pulp, and the juice, however not the whole fruit. The whole fruit would result in a bitter product.
Or more to the point:
Peanut butter is a creamy spread made of ground peanuts, and jam is a spread made of fruit preserves.
On the lighter side:
This joke was raised on "How I Met Your Mother" without disclosing the answer to the joke... The answer below has been perpetuated as a "supposed" answer to the question... and as such has pretty much taken on a life of mythical proportions with hundreds of web postings discussing it, almost all of them leading back to "How I Met Your Mother":
"You can't peanut butter your di*k up someone's a$$"
Well jelly is freshed squeezed from fruit but prezerves are real jelly with alot of chemicals added
Jelly is made from the juice of the fruit with all the pulp strained out. Jam includes the pulp of the fruit and sometimes even whole bits of the chopped fruit.
Jam is chunky and jelly is spreadable
Its Chicken Toe Nails with Jam & Marmalade
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